FDA Warns of Serious Breathing Problems Caused by Gabapentinoids

By Pat Anson, PNN Editor

The U.S. Food and Drug Administration is warning that serious breathing problems can occur in patients who use gabapentin or pregabalin with opioids or other drugs that depress the central nervous system. The elderly and patients with lung problems are at higher risk when they use the drugs, according to an FDA drug safety communication.

The advisory is the latest in a series of warnings about gabapentinoids, a class of nerve medication increasingly prescribed as an alternative to opioid painkillers. There are growing reports of gabapentinoids being abused or raising the risk of overdose and suicide.

“Reports of gabapentinoid abuse alone, and with opioids, have emerged and there are serious consequences of this co-use, including respiratory depression and increased risk of opioid overdose death,” Douglas Throckmorton, MD, deputy director for Regulatory Programs in the FDA’s Center for Drug Evaluation and Research, said in a statement.

“In response to these concerns, we are requiring updates to labeling of gabapentinoids to include new warnings of potential respiratory depressant effects. We are also requiring the drug manufacturers to conduct clinical trials to further evaluate the abuse potential of gabapentinoids, particularly in combination with opioids, with special attention being given to assessing the respiratory depressant effects.”

Gabapentinoid products include gabapentin, which is marketed under the brand name Neurontin, and pregabalin, which is marketed as Lyrica. Generic versions of the drugs are also available.

Gabapentinoids were originally developed to prevent seizures, but their use has tripled over the past 15 years. The drugs are approved to treat a variety of chronic pain conditions, such as fibromyalgia, neuropathy and shingles. They are also widely prescribed off-label.

According to the FDA, over 13 million people filled a prescription for gabapentin in 2016, while over 2 million patients were prescribed pregabalin. Nearly one in five of those patients were also taking opioids.

“Pairing an opioid with any CNS depressant – a gabapentinoid, benzodiazepine, sedating antidepressant, sedating antipsychotic, antihistamine, or other product – will increase the risk of respiratory depression. Shifting treatment from one CNS depressant to another may pose similar risks,” the FDA said.

A Dozen Deaths

The agency said it received 49 case reports of serious breathing problems in patients taking gabapentinoids, including 12 people who died from respiratory depression. It’s advising doctors, caregivers and patients taking gabapentinoids to be alert for signs of confusion, disorientation, dizziness, sleepiness, slow or shallow breathing, unresponsiveness, or bluish-colored lips, fingers and toes.

A 2018 study by Australian researchers found that gabapentinoids often had side effects such as drowsiness, dizziness and nausea. Another study found that combining gabapentin with opioids significantly raises the risk of dying from an overdose. And a recent analysis of calls to U.S. poison control centers found a significant increase in suicide attempts involving gabapentin.

There have also been increasing reports of gabapentin and pregabalin being abused by illicit drug users, who have learned they can use the medications to heighten the high from heroin, marijuana, cocaine and other substances.

A recent study published in JAMA Internal Medicine found little evidence that gabapentinoids should be used off-label to treat pain and said their effectiveness was often exaggerated by prescribing guidelines. The CDC’s 2016 opioid guideline recommends gabapentin and pregabalin dozens of times as alternatives to opioids, without saying a word about their abuse or side effects.

“Our goal in issuing today’s new safety labeling change requirements is to ensure health care professionals and the public understand the risks associated with gabapentinoids when taken with central nervous system depressants like opioids or by patients with underlying respiratory impairment. However, we do not want to unintentionally increase opioid use by turning prescribers away from this class of pain medications,” Throckmorton said.

Opioids Are Not the Only Pain Meds That Can Be Abused

By Dr. Lynn Webster, PNN Columnist

Contrary to popular opinion, opioids don't cause substance abuse. Opioids certainly may be abused, but it is human biology itself that drives drug abuse.

We often get the message that any other pain treatment would be better than using opioids. However, even non-opioids prescribed for pain can contribute to overdoses and suicides. The same genetic and environmental factors that cause opioid abuse can induce abuse of other drugs, too.

For several years the number of opioid prescriptions has declined significantly, due to public demand and political pressure. According to the IQVIA Institute, there was a 17 percent decrease in the number of opioids prescribed in 2018 alone.

We may have expected that to translate into fewer drug abuse problems. Instead, we have seen an increase in overdoses, hospitalizations and suicides involving non-opioids such as gabapentin, methamphetamines and muscle relaxants.

Less access to prescription opioids has driven some people in disabling pain to seek illegal alternative medications. That has led to a wave of use and abuse of drugs that doctors have not prescribed.

Between 2016 and 2017, the CDC reported a nearly 47% increase in fentanyl-related deaths. Overdoses related to methamphetamine and cocaine have also surged.  

According to Stateline, approximately 14,000 cocaine users and 10,000 meth users died in the United States in 2017, triple the number of deaths in 2012. Deaths involving have heroin also spiked since 2010.  

Gabapentin and Baclofen 

Prescription drugs, too, have fueled the negative statistics. Doctors have felt forced to taper or discontinue opioids. In an attempt to find alternatives for pain management, they have increased the number of gabapentin and baclofen prescriptions. 

As PNN has reported, a recent study published in Clinical Toxicology found a “worrying” increase in calls to U.S. poison control centers about gabapentin (Neurontin) and the muscle relaxer baclofen, coinciding with a decrease in opioid prescriptions. The study analyzed more than 90,000 cases of exposure to gabapentin and baclofen, many of which were coded as suicides or attempted suicides.

“Gabapentin and baclofen are two medications that have seen increased availability to patients as alternatives to opioids for the treatment of acute and chronic pain. With greater accessibility, poison center exposures have demonstrated a marked increase in toxic exposures to these two medications,” wrote lead author Kimberly Reynolds of the University of Pittsburgh.

“As poison center data do not represent the totality of cases in the United States, the steep upward trends in reported exposures reflect a much larger problem than the raw numbers would suggest.”  

Gabapentin is one of the most commonly prescribed drugs in the United States. It is prescribed for epilepsy, hot flashes, migraines, nerve damage, and more. It is also used to treat the symptoms of drug and alcohol detoxification, and to treat pain for patients at higher risk of addiction to opioids.  

Baclofen is a muscle relaxant that has also been substituted for opioids. Other non-opioid drugs such as pregabalin and NSAID’s are being increasingly prescribed as well.  

All Medications Have Risks 

Non-opioids have a role to play in pain management, but it is just as important to understand their dangers. While we need effective alternatives to opioids, it is important to know that alternatives also have risks. That is unavoidable, because all medications carry potential benefits and consequences.  

To decide whether a medication is appropriate for an individual, it is critical to determine whether the potential benefit outweighs potential harm. Gabapentin and baclofen are not bad drugs, but they are not harmless replacements for opioids, either.  

No pain medication, whether it is an opioid or non-opioid, is right for everyone under all circumstances. The next time a physician or nurse practitioner suggests replacing an opioid with gabapentin, baclofen, or another medication, it would be appropriate to ask for a comparison of the risks and benefits. 

Talking with your healthcare provider about your preference for a particular medication does not make you a drug seeker. It helps you become an informed patient. 

Lynn R. Webster, MD, is a vice president of scientific affairs for PRA Health Sciences and consults with the pharmaceutical industry. He is the author of the award-winning book, “The Painful Truth,” and co-producer of the documentary, “It Hurts Until You Die.” You can find Lynn on Twitter: @LynnRWebsterMD.

Opinions expressed here are those of the author alone and do not reflect the views or policy of PRA Health Sciences. 

Gabapentin Linked to Growing Number of Suicide Attempts

By Pat Anson, PNN Editor

We’ve reported several times about the abuse and lack of effectiveness of gabapentin, a nerve medication increasingly prescribed to treat fibromyalgia, neuropathy and other types of chronic pain.

It turns out gabapentin is also involved in a growing number of attempted suicides.

In a large new study published in the journal Clinical Toxicology, University of Pittsburgh researchers looked at over 90,000 calls involving medications to U.S. poison control centers. They found that calls about gabapentin and the muscle relaxant baclofen increased significantly just as opioid prescriptions began declining.

“Gabapentin and baclofen are two medications that have seen increased availability to patients as alternatives to opioids for the treatment of acute and chronic pain. With greater accessibility, poison center exposures have demonstrated a marked increase in toxic exposures to these two medications,” wrote lead author Kimberly Reynolds of the University of Pittsburgh.

“As poison center data do not represent the totality of cases in the United States, the steep upward trends in reported exposures reflect a much larger problem than the raw numbers would suggest.”     

Between 2013 and 2017, calls involving the abuse and misuse of gabapentin went up nearly 120 percent, while reports of baclofen being abused or misused rose nearly 32 percent from 2014 to 2017.

Even more concerning is that calls about attempted suicides involving gabapentin rose 80 percent, while calls about attempted suicides with baclofen increased 43 percent. Co-ingestion of sedatives and opioids were common for both medications.

Only 19 deaths involving gabapentin were identified as possible suicides during the five-year study period, but there were thousands of gabapentin-related calls each year coded as attempted suicides — including over 10,000 calls in 2017 alone.

SOURCE: CLINICAL tOXICOLOGY

“It would be anticipated that patients who are prescribed gabapentin and/or baclofen would be more likely to be treated for mood disorders and pain as they are frequently comorbid and therapy overlaps significantly,” researchers said.

“Gabapentin has specifically been recognized for its misuse and diversion potential, synergistic effect with opioid use, and contribution to use disorders. Baclofen misuse has not been as frequently described but is anecdotally observed and associated with severe toxicity, physical dependence, and complicated withdrawal.”

Gabapentin was the 10th-most widely prescribed drug in the U.S. in 2017. Calls to poison control centers about gabapentin were highest in Kentucky and West Virginia, two of the states hardest hit by the opioid crisis. Calls about baclofen were highest in Kentucky, Maine and New Mexico.

The researchers recommend that patients who are prescribed gabapentin or baclofen be prescreened for substance use disorders, mood disorders and suicidal ideation.

FDA Gabapentin Warning

The Food and Drug Administration warned in 2008 that all patients being treated with gabapentin or ten other antiepileptic drugs should be informed about the risks of suicidal thoughts and actions.

The FDA reviewed 199 clinical trials of the drugs and found that patients who received them had almost twice the risk of suicidal behavior or ideation (0.43%) than patients on a placebo (0.24%). That means there would be one additional case of suicidal thinking or behavior for every 530 patients treated with an antiepileptic drug.

“All patients who are currently taking or starting on any antiepileptic drug for any indication should be monitored for notable changes in behavior that could indicate the emergence or worsening of suicidal thoughts or behavior or depression,” the FDA said.

Gabapentin (Neurontin) and its chemical cousin pregabalin (Lyrica) belong to a class of nerve medication called gabapentinoids. Both drugs were originally developed to treat epileptic seizures, but are now widely prescribed off label to treat a variety of chronic pain conditions.    

A recent Swedish study found that patients taking gabapentinoids had higher rates of overdose, suicide and suicidal behavior than the general population. The risks were strongest in teens and young adults.

A recent clinical review found little evidence that gapapentinoids should be used off-label to treat pain and that prescribing guidelines often exaggerate their effectiveness. The CDC’s controversial 2016 opioid guideline, for example, calls gabapentin and pregabalin “first-line drugs” for neuropathic pain.

In a new draft report being funded by the CDC, researchers say gabapentin showed only “small improvements” in pain for people with diabetic peripheral neuropathy and fibromyalgia. The study by the Agency for Healthcare Research and Quality (AHRQ) is expected to finalized in early 2020.

8 of 10 Doctors Won’t Take New Patients on Opioids

By Pat Anson, PNN Editor

Nearly three quarters of primary care doctors (72%) worry that chronic pain patients will use illicit drugs if they lose access to prescription opioids, according to a new survey by Quest Diagnostics. And 77% believe the stigma surrounding drug addiction impairs patient care.

Despite those concerns about patient stigma and illegal drug use, the online survey of 500 physicians found that 8 out of 10 are reluctant to take on new patients who are currently prescribed opioids.

“Quest Diagnostics undertook this research so that we could provide insights into the evolving drug crisis and the potential role of physicians’ perspectives about their patients in drug misuse and use disorders,” said Harvey Kaufman, MD, Senior Medical Director, Quest Diagnostics.

“We found that primary care physicians, who are on the front lines of the drug epidemic, are well-intentioned but under-prepared and may miss some of the drug misuse risks affecting their patients.”

Quest compared the survey results to an analysis of 4.4 million drug tests ordered by physicians for patients prescribed opioids and other controlled substances. The findings suggest that many physicians have a poor understanding of their patients’ drug use.

For example, Quest found that over half of patients (51%) showed signs of misusing a prescribed drug, yet 72% of physicians believe their patients take controlled medications as prescribed.

Quest broadly defines drug “misuse” by including the absence of a prescribed medication. Many patients choose not to take a drug because they can’t afford it, don’t like its side effects, or feel they don’t need it. Patients required to have drug tests are also not representative of the general population.

Other key findings:

• 62% of doctors believe the opioid crisis will morph into a prescription drug crisis

• 24% of patients combined legal medications with other non-prescribed drugs or illicit substances

• 95% of doctors are confident in their ability discuss drug misuse with patients, but only 55% actually do

• 70% of doctors wish they had more training on how to taper patients off opioids.

• 75% of doctors wish they had more training on addiction

The Quest lab tests also found concerning results about the misuse of gabapentin (Neurontin), an anti-convulsant drug increasingly prescribed to treat pain. Over 13% of patients showed signs of misusing gabapentin in 2018, making it the mostly commonly misused prescription drug.

Nearly 8 out of 10 doctors (78%) said they often prescribe gabapentin as an alternative to opioids, but only 34% were concerned about its misuse.

“A vast majority of physicians recognize the need for more tools to prevent opioid drug misuse and substance use disorders, and that is why many are tightening opioid prescribing and turning to gabapentin as an alternative,” said pain specialist Jeffrey Gudin, MD, Senior Medical Advisor, Quest Diagnostics.

“While gabapentin may not have opioids’ addictive potential, it can exaggerate euphoric effects when combined with opioids or anxiety medications. This drug mixing is dangerous.”

Gabapentin and pregabalin (Lyrica) belong to a class of nerve medication known as gabapentinoids. A recent study found gabapentinoids increase the risk of suicide, overdose, traffic accidents and injuries in younger people. Sales of gabapentinoids have tripled in recent years in the United States, where they are often promoted in prescribing guidelines as safer alternatives to opioids.

One in Four Adults in England Take Addictive Meds

By Pat Anson, PNN Editor

Nearly 12 million people – about one in four adults in England -- are taking addictive prescription drugs to treat depression, anxiety, insomnia or chronic pain, according to a new review by Public Health England (PHE).

The review takes a cautionary view on the use of five drug classes – opioids, antidepressants, benzodiazepines, gabapentinoids, and so-called “z-drugs” such as zolpidem, zopiclone and zaleplon.

“The medicines we looked at help to make millions of people every year feel better and recover from their illness. Doctors can prescribe them because there is good evidence that they work, but they do have some risks,” the PHE report found.

Benzodiazepines, z-drugs, opioids and gabapentinoids are associated with dependence and withdrawal, while there’s a risk of withdrawal with antidepressants. When the drugs are taken in combination or in high doses, there is also risk of respiratory depression and overdose.  

About half the patients prescribed the drugs in England had been taking them for at least a year — a sign of dependence. But the report cautions doctors not to abruptly discontinue the drugs and to taper them gradually, if at all.

“There is a view that a sub-population of chronic pain patients can be prescribed long-term opioids at relatively stable doses so that their analgesia and functioning can be maintained with good adherence and tolerable side-effects,” the report found.

“We do not want to put anyone off safely using medicines that could help them. Stopping or limiting the use of medicines could also cause harm, including increasing the risk of suicide or making people try to get medicines or illegal alternatives from less safe sources, such as illegal websites or drug dealers.”

Increasing Use of Antidepressants and Gabapentinoids

Antidepressants were prescribed to about 7.3 million people in England or 17% of the adult population. Opioids were prescribed to 5.6 million patients, followed by gabapentinoids (1.5 million), benzodiazepines (1.4 million) and z-drugs (1 million). Prescriptions for opioids, benzodiazepines and z-drugs are dropping, while the use of antidepressants and gabapentinoids is growing. 

Gabapentinoids such as pregabalin (Lyrica) and gabapentin (Neurontin) were originally developed to treat epilepsy, but the drugs are increasingly prescribed in the UK to treat neuropathy and other types of chronic pain. PHE researchers found only marginal evidence that they are effective for pain and alarming signs that they are being misused. 

“Gabapentinoids have come to be used for a wider range of indications than is supported by the evidence or their licensing, and they have sometimes been prescribed in place of opioids or benzodiazepines in the likely-mistaken belief that they are less liable to misuse or dependence, and lack of awareness of the withdrawal problems that can arise when prescribing is stopped,” the report said. 

Prescriptions for opioids and gabapentinoids were 1.6 times higher in parts of England with more poverty. People in poor areas are also more likely to be prescribed medicines for longer periods. Prescription rates for women are about 1.5 times higher than for men. Prescription rates also increased with age.

Are You Paying Too Much for Pregabalin?

By Pat Anson, PNN Editor

It didn’t take long for cheaper generic versions of pregabalin to take a bite out of Pfizer’s monopoly of Lyrica, a drug widely used to treat fibromyalgia, diabetic neuropathy and other types of chronic pain.

Last month the U.S. Food and Drug Administration gave approval to rival drug makers to begin selling generic pregabalin after Pfizer’s patent on Lyrica expired. According to FiercePharma, Pfizer lost about a third of the market for pregabalin to 16 competitors by the end of July.  

It’s not hard to see why. According to Healthcare Bluebook, a 60-day supply of 75mg Lyrica sells for a “fair price” of $472. That compares to generic versions that sell for about $28.

“The price that most patients pay is set by insurers. The cost difference for patients between brand-name Lyrica and generic pregabalin may vary depending on the patients’ insurance plan, the state in which their prescription is filled, or the pharmacy where they pick up their prescription,” said Steven Danehy, a Pfizer spokesman.

As of August 9, Lyrica still had about 43% of the market for pregabalin, but that’s likely to change as patients, doctors and insurers became more aware of the significant difference in price.

Pregabalin is approved by the FDA for the treatment of pain associated with shingles, spinal cord injury, fibromyalgia, and diabetic peripheral neuropathy. It is also commonly prescribed "off label" for other types of chronic pain.

Pregabalin is a Schedule V controlled substance, which means it has a low potential for abuse. In recent years, however, there is growing concern that pregabalin and its sister drug gabapentin (Neurontin) are being abused and overprescribed.

The drugs, which belong to a class of nerve medication called gabapentinoids, were originally developed to treat epilepsy, not pain. Prescriptions for gabapentinoids have tripled over the past 15 years as more doctors prescribed them as “safer” alternatives to opioids.

Deaths involving gabapentinoids have increased in the UK, Australia and Canada, where some addicts have learned the drugs can heighten the euphoric effect of heroin and other opioids. The drugs were recently classified as controlled substances in the UK.

Gabapentinoids Raise Risk of Suicide and Overdose in Younger People

By Pat Anson, PNN Editor

Gabapentinoids – a class of nerve medication widely prescribed to treat chronic pain – increase the risk of suicide, overdose, traffic accidents and head or body injuries in younger people, according to a large new study published in The British Medical Journal.

Sales of the two main gabapentinoids, pregabalin (Lyrica) and gabapentin (Neurontin), have tripled in recent years in the United States, where they are often promoted in prescribing guidelines as safer alternatives to opioids.

A team of researchers followed nearly 192,000 people enrolled in the Swedish Prescribed Drug Register who filled prescriptions for gabapentinoids on at least two consecutive occasions from 2006 to 2013. That information was compared to data in the Swedish Patient Register, which collects information on hospital admissions and outpatient care, as well as the Swedish Cause of Death Register.

Over the study period, researchers found that patients taking gabapentinoids had higher rates of suicide or suicidal behavior (5.2%), unintentional overdose (8.9%), traffic accidents (6.3%) and head or body injuries (36.7%) than the general population.

The risks were strongest for people who were prescribed pregabalin and were most pronounced among adolescents and young adults aged 15 to 24.  Patients aged 55 and older taking gabapentinoids were not at greater risk.

Researchers believe the drugs may have more impact on younger people because they have faster metabolisms, which could lead to withdrawal problems that affect their impulsivity and emotions.

“Overall, gabapentinoids seem to be safe for a range of outcomes in older people. However, the increased risks found in adolescents and young adults prescribed gabapentinoids, particularly for suicidal behaviour and unintentional overdoses, warrant further research,” said lead author Seena Fazel, MD, of the University of Oxford in England.

“If our findings are triangulated with other forms of evidence, clinical guidelines may need review regarding prescriptions for young people, and those with substance use disorders. Further restrictions for off-label prescription may need consideration.”

Pregabalin is approved by the FDA to treat diabetic nerve pain, fibromyalgia, post-herpetic neuralgia caused by shingles and spinal cord injuries; while gabapentin is approved for epilepsy and post-herpetic neuralgia. Both drugs are also widely prescribed off-label to treat back pain, depression, migraine and other chronic conditions.

Gabapentinoids are increasingly being used recreationally by addicts who have found the medications enhance the effects of heroin and other opioids. The drugs were recently classified as controlled substances in the UK.

Gabapentin is not currently scheduled as a controlled substance by the DEA, while Lyrica is classified as a Schedule V controlled substance, meaning it has low potential for addiction and abuse.  

A recent clinical review found little evidence the drugs should be used off-label to treat pain and that prescribing guidelines often exaggerate their effectiveness. The CDC’s controversial opioid guideline, for example, calls gabapentin and pregabalin “first-line drugs” for neuropathic pain.

“Despite documentation that these drugs were promoted improperly for off-label treatment of pain, the recent rapid increase in prescribing of gabapentinoids suggests a persisting sense among clinicians that gabapentinoids are highly effective pain medications,” wrote Christopher Goodman, MD, and Allan Brett, MD, of the University of South Carolina School of Medicine.

“Guidelines and review articles have contributed to this perception by often uncritical extrapolation from FDA-approved indications to off-label use.”

Doctors Say Guidelines Exaggerate Effectiveness of Lyrica and Neurontin

By Pat Anson, PNN Editor

There is little evidence that gabapentin (Neurontin) and pregabalin (Lyrica) should be used off-label to treat pain and prescribing guidelines often exaggerate their effectiveness, according to a new clinical review in JAMA Internal Medicine.

Gabapentin and pregabalin belong to a class of nerve medication known as gabapentinoids. The drugs were originally developed to prevent seizures, but their use has tripled over the past 15 years as more doctors prescribed them for a variety of chronic pain conditions. It is a common practice for doctors to prescribe drugs “off label” for treatments that are not FDA-approved.

“Gabapentinoids have become frequent first-line alternatives in patients with chronic pain from whom opioids are being withheld or withdrawn, as well as in patients with acute pain who traditionally received short courses of low-dose opioid,” wrote Christopher Goodman, MD, and Allan Brett, MD, of the University of South Carolina School of Medicine.

“The evidence to support off-label gabapentinoid use for most painful clinical conditions is limited. For some conditions, no well-performed controlled trials exist.”

Gabapentin is only approved by the FDA to treat epilepsy and neuropathic pain caused by shingles, but it is prescribed off label to treat depression, ADHD, migraine, fibromyalgia and bipolar disorder.  Pregabalin is approved by the FDA to treat diabetic nerve pain, fibromyalgia, post-herpetic neuralgia caused by shingles and spinal cord injuries, but it is also widely prescribed off-label to treat other types of pain.

The drugs are sold by Pfizer under the brand names Lyrica and Neurontin. The company has paid nearly $1 billion in fines for misleading and improper marketing of the drugs for off-label use.

“Despite documentation that these drugs were promoted improperly for off-label treatment of pain, the recent rapid increase in prescribing of gabapentinoids suggests a persisting sense among clinicians that gabapentinoids are highly effective pain medications,” the doctors wrote.

“Guidelines and review articles have contributed to this perception by often uncritical extrapolation from FDA-approved indications to off-label use.”

Goodman and Brett say the wording in many medical guidelines “reinforces an inflated view of gabapentinoid effectiveness” by falsely claiming the drugs should be used to treat all types of nerve pain.

“Another example is the 2016 guideline on opioid prescribing from the U.S. Centers for Disease Control and Prevention, which states broadly that gabapentin and pregabalin are first-line drugs for neuropathic pain, without further detail or specification,” they wrote. “Even for treatment of diabetic neuropathy (for which pregabalin is FDA approved and gabapentin is off-label), guideline conclusions tend to exaggerate effectiveness.”

Many patients who take gabapetinoids have side-effects such as dizziness or drowsiness, and there are an increasing number of reports that the drugs are being abused and sold on the street.   

Goodman and Brett have sounded the alarm before about the drugs, warning in a 2017 commentary in the The New England Journal of Medicine that “gabapentinoids are being prescribed excessively.”

They say doctors should do a better job warning patients about the side effects of gabapentinoids and the drugs should be stopped if a patient reports little or no benefit.  They also think medical guidelines should be revised to stop the promotion of gabapentinoids for any pain labeled as neuropathic.

Risky Combination: Opioids and Gabapentin

By Pat Anson, PNN Editor

Opioid medication significantly reduces low back pain, but opioids should not be used in combination with gabapentin (Neurontin) because of their limited effectiveness and potential for abuse, according to the authors of a small new study presented at the annual meeting of the American Academy of Pain Medicine.

"In these days, when we are focusing on reduction of opioids due to opioid crisis in the U.S., gabapentin could be an important part of multimodal non-opioid pain management," N. Nick Knezevic, MD, of the University of Illinois in Chicago told MedPage Today. "However, it should not be given to all patients since the effectiveness in chronic pain patients, particularly in those with low back pain, is limited."

KAISER HEALTH NEWS

In a retrospective study, Knezevic and his colleagues looked at 156 patients with low back pain; half of whom were treated with opioids alone and the other half with a combination of opioids and gabapentin.

“According to our study, the combination of gabapentin with opioids was not statistically superior in providing pain relief, in contrast to opioids alone, in patients with chronic pain. Our results are in line with recent guidelines for low back pain treatment that reflect the need to assess the recommendation of gabapentinoids for chronic pain in patients already taking opiods to mitigate risk factors of abuse and overdose,” researchers found.

Gabapentin is an anticonvulsant that was originally developed as a treatment for epilepsy, but is now widely prescribed for a variety of chronic pain conditions. Its use in primary care as a treatment for chronic back and neck pain has risen by 535% in the last decade, despite little evidence of its effectiveness.

"The fact that anticonvulsants are often advertised to be effective for 'nerve pain' may mislead the prescriber to assume efficacy for low back pain or sciatica," Oliver Enke, MD, of the University of Sydney, told MedPage.

A 2018 study by Australian researchers found that gabapentinoids did not reduce back pain or disability and often had side effects such as drowsiness, dizziness and nausea. Another recent study found that combining gabapentin with opioid medication significantly raises the risk of dying from an overdose than opioid use alone.

There have been increasing reports of gabapentin being abused by drug addicts, who have learned they can use the medications to heighten the high from heroin, marijuana, cocaine and other substances.

The CDC’s opioid prescribing guideline recommends gabapentin as a safer alternative to opioids, without saying a word about its potential for abuse or side effects.

A 2017 commentary in the The New England Journal of Medicine warned that gabapentinoids -- a class of nerve medication that includes both gabapentin and pregabalin (Lyrica) -- are being overprescribed.

"We believe… that gabapentinoids are being prescribed excessively — partly in response to the opioid epidemic,” wrote Christopher Goodman, MD, and Allan Brett, MD. “We suspect that clinicians who are desperate for alternatives to opioids have lowered their threshold for prescribing gabapentinoids to patients with various types of acute, subacute, and chronic noncancer pain."

Can Gabapentin Improve Your Sex Life?

By Pat Anson, PNN Editor

Over the years the nerve drug gabapentin (Neurontin) has been used to treat a cornucopia of chronic pain conditions, from fibromyalgia and diabetic neuropathy to hot flashes and shingles.

Gabapentin is so widely prescribed that a Pfizer executive once called the drug “the snake oil of the twentieth century” because researchers found it successful in treating just about everything they studied.

Add sexual function to the list.

In a small study, researchers at Rutgers University found that gabapentin improved sexual desire, arousal and satisfaction in 89 women with provoked vulvodynia, a chronic condition characterized by stinging, burning and itching at the entry to the vagina. Vulvar pain often occurs during intercourse, which leads to loss of interest in sex.

The improvements in desire, arousal and sexual satisfaction were small, but considered “statistically significant” in research parlance. Gabapentin did not improve lubrication or orgasm.

"Our theory was that reducing pelvic floor muscle pain might reduce vulvodynia pain overall and thus improve sexual function," said Gloria Bachmann, MD, director of the Women's Health Institute at Rutgers and lead author of the study published in the Journal of Obstetrics and Gynecology.

"We found that women with greater muscle pain responded better in terms of pain and improved arousal than those with less pain, which suggests that Gabapentin be considered for treatment in women who have significant muscle tightness and spasm in the pelvic region.”

Does this mean gabapentin is a female version of Viagra? Not necessarily, says Bachmann, who stressed that the study only focused on women with vulvodynia.

“We didn't research the question of gabapentin enhancing sexual function in all women,” Bachmann wrote in an email to PNN. “The decision to give gabapentin to a woman who reports chronic vulvar pain and sexual dysfunction would have to be made on an individual basis, depending on her medical history and the results of her physical and pelvic examination.

“From the data, it appears that women with increased muscle tenderness of the pelvic floor may be the group who benefit most from gabapentin.”

Sales of gabapentin have soared in recent years — not because it improves sexual satisfaction — but because it is seen as a safer pain reliever than opioid medication.

Patients prescribed gabapentin often complain of side effects such as mood swings, depression, dizziness, fatigue and drowsiness.  Drug abusers have also discovered that gabapentin can heighten the effects of heroin, cocaine and other illicit substances, and it is increasingly being abused.

Patients at Ohio Hospital Have Surgery Without Opioids

By Pat Anson, PNN Editor

Would you want to go through a major surgery without the use of opioid pain medication?

Patients at an Ohio hospital are getting acetaminophen, gabapentin and nonsteroidal anti-inflammatory drugs (NSAIDs) to manage their pain before and after colorectal operations – and their surgeons say the treatment results in better patient outcomes.

“Over 75 percent of our elective colorectal patients underwent surgery without requiring narcotic analgesics postoperatively, including after discharge,” says Sophia Horattas, MD, of Cleveland Clinic Akron General Hospital.  “During this time period our patient satisfaction scores improved as well as patients' perceptions of pain control.”

All eight general surgeons at Akron General adopted the non-opioid treatment protocol in 2016, applying it to patients who had elective colon operations. Prior to surgery, the patients were all educated about pain management, non-opioid analgesics, and the risks associated with opioids.

Researchers evaluated 155 of the patients and presented their findings this week at the American College of Surgeons Clinical Congress in Boston.

Overall, 83 percent (128) of the patients did not need opioid medication after their operations. Among those who did, use of opioids before surgery was often an indicator that they would want them again. Nine of the 15 patients who had prior experience with opioids used them again after surgery.

Among the remaining 140 patients who did not use opioids before surgery, 85 percent (119) did not need opioid medication for pain relief.

The researchers found that patients who used opioid painkillers typically spent more time in the hospital; an average of 2.7 days vs. 2.3 days for the non-narcotic group.

“Patient education played a large role in protocol compliance, and patient satisfaction improved as they were able to avoid prolonged fasting, achieve improved pain control without the side effects of narcotic analgesia, and be discharged home earlier,” said Horrattas.

For pre-emptive analgesia before surgery, patients received one dose of acetaminophen, gabapentin, and the NSAID celecoxib (Celebrex).  In the operating room, patients received a nerve block and underwent anesthesia with the non-opioid pain relievers ketamine and lidocaine.   

Surgeons at Akron General have since adopted the non-opioid protocol for other major abdominal operations, such as bariatric procedures, gynecological and genital/urinary tract procedures, and liver and gall bladder operations.

“One of the great things about our protocol is its reproducibility.  Once we developed our program, we found that it could be standardized across departments with consistently reproducible results,” said Horattas.

Akron General’s protocol is similar to guidelines adopted by the American Pain Society (APS) for postoperative pain care. The APS also encourages the use of non-opioid medications such as acetaminophen, NSAIDs, gabapentin (Neurotin) and pregabalin (Lyrica).  

Akron General gets below average ratings for patient satisifaction from Hospital Compare, a Medicare survey that asks patients about their experiences during a recent hospital stay. The hospital received only two of a possible five stars, which places it in the bottom third of hospitals nationwide. Only 68% of Akron General’s patients said they would definitely recommend the hospital.

According to Healthgrades, 3 percent of the patients died after a colorectal surgery at Akron General, which is slightly below the national average for that procedure.

Opioid Addiction Rare After Surgery

In recent years, many hospitals have shifted away from routinely giving patients opioids during and after major surgeries -- even though it is rare for patients to become chronic opioid users.

A large Canadian study found that only 0.4% of elderly patients that were prescribed opioids while recovering from a heart, lung, colon, prostate or hysterectomy operation were still using them a year after their surgeries.

Another large study published this year in the British Medical Journal found similar results. Only 0.2% of patients who were prescribed opioids for post-surgical pain were later diagnosed with opioid dependence, abuse or a non-fatal overdose.

Long-term opioid use after dental surgeries is also rare. A recent study published in JAMA found that only 1.3% of teens and young adults who were given opioids after wisdom teeth removal were still being prescribed opioids months after their initial prescription.

The vast majority of patients still prefer opioids and perceive them as the most effective form of pain relief after surgery. In a recent survey of over 500 adults who were scheduled to have surgery, researchers at Thomas Jefferson University Hospital in Philadelphia found that 77% expected opioids, 37% expected acetaminophen, and 18% expected a NSAID for pain relief.

"Patients often assume they will receive opioids for pain, believing they are superior, and therefore may pressure physicians to prescribe them after surgery," said lead author Nirmal Shah, DO, an anesthesia resident at Thomas Jefferson University Hospital.

"But research shows opioids often aren't necessarily more effective. Clearly, we need to provide more education to bridge that gap and help patients understand that there are many options for pain relief after surgery, including other pain medications such as acetaminophen and ibuprofen."

Lyrica Not Effective for Treating Traumatic Nerve Pain

By Pat Anson, Editor

Pregabalin is not effective in relieving chronic pain caused by traumatic nerve injury, but it may be useful as an analgesic in treating pain after surgery, according to a new study published in the Journal of Neurology.

The placebo-controlled study followed 539 patients in North America, Europe, Africa and Asia for three months. About half had nerve pain after surgery, while the rest had nerve pain after an accident or trauma.

Researchers found that pregabalin was not an effective pain reliever for the patients with traumatic nerve injuries, but the drug did provide better pain relief than placebo for the surgery patients.

"While these finding show that pregabalin is not effective in controlling the long-term pain for traumatic injury, it may provide relief for patients (that) experience post-surgical pain," said lead author John Markman, MD, director of the Translational Pain Research Program in the University of Rochester Department of Neurosurgery.

"The possibility that there was pain relief for those patients who had a hernia repair, or breast surgery for cancer, or a joint replacement lays the groundwork for future studies in these post-surgical syndromes where there is so much need for non-opioid treatments."

Pregabalin, which is sold by Pfizer under the brand name Lyrica, is FDA-approved for the treatment of chronic pain associated with shingles, spinal cord injury, fibromyalgia, and diabetic peripheral neuropathy.

It is also commonly prescribed as an "off label" treatment for other types of chronic pain and as an alternative to opioid medication.

A major challenge for doctors is that biological changes in nerves and other tissues while healing from surgery or trauma vary from one patient to the next. There is also no diagnostic method that allows doctors to identify which patients will respond to a particular type of pain treatment.

"Given the rising rates of surgery and shrinking reliance on opioids, it is critical that we understand how to study new drugs that work differently in patients like the ones included in this study," Markman added.

While critics often say there is little or no evidence to support the long-term use of opioids, the same is true for other types of pain medication, including pregabalin. Nevertheless, in its guideline for opioids, the Centers for Disease Control and Prevention recommends pregabalin and its chemical cousin gabapentin as alternatives for treating chronic pain – without even mentioning their side effects or potential for abuse.

Pregabalin and gabapentin belong to a class of nerve medication called gabapentinoids, which were originally developed to treat epilepsy, not pain. In recent, deaths involving gabapentinoids have increased in the UK, Australia and Canada, where some addicts have learned the drugs can heighten the euphoric effect of heroin and other opioids.

The use of pregabalin and gabapentin has tripled in the U.S. over the past decade, but health officials have only recently started looking into their misuse and abuse. While gabapentin has a warning label cautioning users who take the drug with opioids, there is no similar warning for pregabalin.

CDC: Most Overdoses Involve Illicit Opioids

By Pat Anson, Editor

The Centers for Disease Control and Prevention has released a new report further documenting the changing nature of the opioid crisis and the lesser role played by opioid pain medication in drug overdoses.

The report from the CDC’s Enhanced State Opioid Overdose Surveillance (ESOOS) program looked at nearly 12,000 opioid overdose deaths in 11 states from July 2016 to June 2017. 

Nearly 59 percent of the overdose deaths were attributed to illicit opioids like fentanyl and heroin, while 18.5% had both illicit and prescription opioids.

Less than 18% tested positive for prescription opioids only.

Many of the deaths involved someone with a criminal record or a history of substance abuse. Nearly one in ten overdose victims had been released from a prison or jail in the month preceding the overdose.

Evidence of injection drug use was found in about half of the illicit opioid deaths and about 15% had lived through a previous overdose.

OPIOID OVERDOSES (2016-2017)

• Illicit Opioids
• Illicit & Rx Opioids
• Rx Opioids
• Unknown Opioid

• Illicit Opioids
• Illicit & Rx Opioids
• Rx Opioids
• Unknown Opioid

Source: CDC Enhanced State Opioid Overdose Surveillance

There were also distinct differences in demographics between the illicit and prescription opioid overdoses. The average age of people who died from prescription opioids was 47, while the average age of those who died from illicit opioids was 36. Men were far more likely to overdose on an illicit opioid (73%), while more women (51%) died from a prescription opioid overdose.

“Findings from this analysis indicate that illicit opioids were a major driver of opioid deaths, especially among younger persons, and were detected in approximately three of four deaths overall. Prescription opioids were detected in approximately four of 10 deaths,” CDC researchers reported in the Morbidity and Mortality Weekly Report (MMWR).

Polysubstance Overdoses

Another key finding from the report was the frequent involvement of other drugs in opioid overdoses.

Benzodiazepines – a class of anti-anxiety medication that includes Xanax and Valium – were detected in over half of the prescription opioid deaths and in about one of every four illicit opioid deaths. “Benzos” depress the central nervous system and raise the risk of overdose when used with opioids. 

Gabapentin (Neurontin) – an anti-seizure drug widely prescribed off-label to treat pain -- was detected in over 21% of the prescription opioid deaths and in about 10% of the other overdoses.

“The combined use of gabapentin and opioids might be an indicator of high-risk opioid misuse and requires further study,” researchers said. “Extensive use of cocaine and benzodiazepines among deaths where both prescription and illicit opioids were detected highlights the need for prevention and treatment programs to address polysubstance use.”

Because so many drugs – both legal and illegal -- are often involved in overdoses, the CDC researchers cautioned that efforts to prevent opioid abuse “should not focus exclusively on one opioid type.”

That warning is at odds with the CDC’s own Rx Awareness program, an advertising campaign launched last year that focuses solely on the stories of people “whose lives were torn apart by prescription opioids.”

Fentanyl, heroin and other drugs commonly involved in overdoses are not addressed by the Rx Awareness campaign. 

“Specificity is a best practice in communication, and the Rx Awareness campaign messaging focuses on the critical issue of prescription opioids. Given the broad target audience, focusing on prescription opioids avoids diluting the campaign messaging,” the CDC explained when launching the campaign.

RX AWARENESS AD

Earlier this year, CDC researchers acknowledged that they overestimated the number of overdoses involving prescription opioids by combining them with deaths attributed to illicit fentanyl and other synthetic opioids. The ESOOS program was launched, in part, to correct that error.

ESOOS data is considered more reliable because it includes blood toxicology reports, as well as death certificates, medical examiner and coroner reports, death scene investigations, and an overdose victim’s history of substance abuse. A total of 32 states participate in ESOOS.

The 11 states participating in the current report include: Oklahoma, New Mexico, Maine, Massachusetts, New Hampshire, Rhode Island, Missouri, Ohio, West Virginia, Wisconsin and Kentucky.

Studies Warn of Pregabalin Deaths

By Pat Anson, Editor

Two new studies – one in Canada and one in Australia – should give pause to patients who use opioids and pregabalin (Lyrica), an anticonvulsant medication increasingly prescribed for fibromyalgia, neuropathy and other chronic pain conditions. Both studies found a number of overdose deaths that involve – but were not necessarily caused -- by pregabalin.

The Canadian study, published in the Annals of Internal Medicine, looked at over 1,400 patients in Ontario on opioid medication from 1997 to 2016 who died from opioid-related causes. Another group of over 5,000 surviving opioid patients was used as a control group.

Researchers found that patients who were co-prescribed opioids and pregabalin had a significantly higher risk of an overdose.

The risk of death was over two times higher for patients receiving opioids and a high dose of pregabalin (over 300mg) compared to those who took opioids alone.

Patients on a low or moderate dose of pregabalin also had a heightened risk, although not as large.

Researchers say pregabalin has a sedative effect and may interact with opioids in ways that increase respiratory depression. Few doctors and patients are aware of the risk, even though over half of Ontario residents who begin pregabalin therapy are also prescribed an opioid.

"There is an important drug interaction between opioids and pregabalin that can lead to increased risk of fatal overdose, particularly at high doses of pregabalin," lead author Tara Gomes, PhD, of the Institute for Clinical Evaluative Sciences (ICES) and St. Michael's Hospital in Toronto, told MedPage Today.

"Clinicians should consider carefully whether to prescribe opioids and pregabalin together. If they decide that both medications are clinically appropriate, they should start with low doses and monitor their patients closely."

Lyrica (pregabalin) and Neurontin (gabapentin) are both made by Pfizer and belong to a class of anticonvulsant nerve medication called gabapentinoids. Sales of gabapentinoids have tripled in recent years, in part because of CDC prescribing guidelines that recommend the drugs as alternatives to opioid medication.  

U.S. health officials have only recently started looking into the misuse and abuse of gabapentinoids, which are increasingly used by addicts to enhance the euphoric effects of heroin and other illicit opioids. While gabapentin  has a warning label cautioning users who take the drug with opioids, there is no similar warning for pregabalin.

“Although current product monographs for gabapentin contain warnings about serious adverse events when this agent is combined with opioids, those for pregabalin do not. The importance of our finding warrants a revision of the pregabalin product monographs,” wrote Gomes.

Pregabalin Abuse in Australia

Health officials in Australia are also concerned about the growing use of pregabalin.  Researchers at the NSW Poisons Information Centre say poisoning cases involving pregabalin rose from zero in 2005 to 376 cases in 2016.

“Our study shows a clear correlation between the rapid and continuous rise of pregabalin dispensing and an increase in intentional poisonings and deaths associated with pregabalin,” said lead author Dr. Rose Cairns, a specialist at the NSW Poisons Information Centre.

According to the Australian Journal of Pharmacy (AJP), there have been 88 recorded deaths associated with pregabalin in recent years. Most of the deaths involved young, unemployed males who had a history of substance abuse, particularly with opioids, benzodiazepines, alcohol and illicit drugs.

“We believe that Australian doctors may not be aware of the abuse potential of pregabalin,” Cairns said. “Most patients who are prescribed this medication are in the older population but the group who are at high risk of overdosing are much younger. These people are likely to have been prescribed pregabalin despite having a history of substance abuse.”

According to researchers, up to two-thirds of people who intentionally misused pregabalin had a prior documented substance abuse history. “Prescribers need to consider this growing body of evidence that pregabalin has abuse potential before prescribing, especially to patients with substance abuse history,” said Cairns.

Pfizer did not respond to a request for comment on the Canadian and Australian studies.

Lyrica and Neurontin Ineffective for Low Back Pain

By Pat Anson, Editor

Lyrica, Neurontin and other anti-convulsant drugs are ineffective for treating low back pain and may even be harmful to patients, according to a new study published in the Canadian Medical Association Journal.

Prescriptions for anti-convulsant drugs have soared in recent years, as doctors seek “safer” alternatives to opioid pain medication.  Lyrica (pregabalin) and Neurontin (gabapentin) belong to a class of anti-convulsant nerve medications known as gabapentinoids. They are primarily used for treating nerve pain and fibromyalgia, but are increasingly being prescribed off-label to treat lower back and neck pain.

Australian researchers reviewed 9 placebo-controlled randomized trials and found high quality evidence that gabapentinoids did not reduce back pain or disability and often had side effects such as drowsiness, dizziness and nausea.

“The take-home message is that anti-convulsants are not effective and can lead to adverse effects in people with low back pain and radiating leg pain (eg, sciatica), so they should not be recommended to this patient population,” lead author Oliver Enke, MD, a researcher at the University of Sydney Medical School, told Helio Family Medicine.

Low back pain is the world’s leading cause of disability. Guidelines for treating low back pain usually recommend physical therapy, exercise and non-opioid pain relievers rather than stronger analgesics such as opioids or anti-convulsants.

A 2017 study published in PLOS Medicine also warned that pregabalin and gabapentin were ineffective for low back pain and have a “significant risk of adverse effects.” 

PNN readers often complain about side effects from Lyrica and Neurontin.

“I have used both medicines and neither help with lower back pain for me,” said Sheri. “I will say the mental confusion and memory loss on Lyrica is very real, but it takes a slight edge of pain away in my body as a whole from the fibromyalgia.”

“I can vouch that Lyrica does not help with back pain,” said Debra. “It helped with the nerve pain but I thought I was literally losing my mind. I couldn't remember simple words or synonyms for words.”

“I've been taking gabapentin for almost six months; it has helped my peripheral neuropathy, but I still suffer every day from arthritis in every joint of my body, including my lower back,” another reader wrote.

Lyrica and Neurontin are both made by Pfizer and are two of the company’s top selling drugs, generating billions of dollars in sales annually. Lyrica is approved by the FDA to treat diabetic nerve pain, fibromyalgia, post-herpetic neuralgia caused by shingles, and spinal cord injuries.

Neurontin is approved by the FDA to treat epilepsy and neuropathic pain caused by shingles, but is also widely prescribed off-label to treat depression, ADHD, migraine, fibromyalgia and bipolar disorder. According to one estimate, over 90% of Neurontin sales are for off-label uses. About 68 million prescriptions were written for gabapentin in the U.S. last year, compared to 44 million in in 2013.

There have been increasing reports of gabapentinoids being abused by drug addicts, who have learned they can use the medications to heighten the high from heroin, marijuana, cocaine and other substances. Gabapentin is not currently scheduled as a controlled substance by the DEA, while pregabalin is classified as a Schedule V controlled substance, meaning it has a low potential for addiction and abuse.