Can Ketamine Treat Fibromyalgia Pain?

By Pat Anson

At a time when the medical and recreational use of ketamine is coming under more scrutiny from law enforcement, a new study highlights its potential value as a treatment for fibromyalgia pain.

Ketamine is an anesthetic drug that is only FDA-approved for depression and anesthesia. But in recent years ketamine infusions are increasingly being used “off-label” for severe chronic pain conditions such as Complex Regional Pain Syndrome (CRPS).

In a small systematic review (a study of studies), researchers in Brazil found that ketamine infusions were safe and effective in relieving fibromyalgia pain. The review was small – just 6 clinical trials involving 115 patients – because ketamine has rarely been considered as a treatment for fibromyalgia due to its potency. Ketamine infusions require constant medical supervision because they put patients into a temporary dream-like state that can lead to hallucinations and out-of-body experiences.

But the Brazilian researchers found the side effects from infusions were mild and short-term, with some fibromyalgia patients experiencing pain relief that lasted for days or weeks.

Fibromyalgia is a poorly understood condition that causes widespread body pain, fatigue, insomnia, brain fog and mood disorders. The FDA has approved only three medications for fibromyalgia, two antidepressants (Cymbalta and Savella) and a nerve drug (Lyrica), but many patients consider the drugs ineffective.

Could ketamine be another option?

“Ketamine infusions might be a reasonable therapeutic approach for short-term relief of symptoms but unsatisfactory at inducing long-term analgesia in FM (fibromyalgia) patients,” the Brazilian research team reported in Advances in Rheumatology. “Future studies that evaluate the safety and effectiveness of ketamine in FM are desired for long-term follow-up. In patients refractory to conventional therapy, ketamine infusions might be a reasonable therapeutic approach.”

A recent case study suggests ketamine does have potential as a long-term treatment. A 68-year-old woman with fibromyalgia experienced “significant, widespread pain relief” after receiving several ketamine infusions over a two-week period. She continued getting infusions twice a week for the next year.    

“Pain relief has persisted under this regimen, along with a demonstrable improvement in quality of life, a reduced use of morphine, and the cessation of anti-depressant medication. This case indicates that long-term ketamine infusions show promise for chronic pain management and that more longitudinal studies on this treatment are warranted,” researchers reported.

‘Targeting and Investigating Doctors’

The positive news about ketamine is being overshadowed by the investigation into the death of actor Matthew Perry, who drowned in a hot tub last year after getting three ketamine injections in one day – none of them while under medical supervision.  Five people, two of them doctors, were recently arrested in connection with Perry’s death, including an alleged drug dealer known as the “Ketamine Queen.”

Perry had long struggled with substance abuse issues, but federal prosecutors say the defendants “were more interested in profiting off Mr. Perry than caring about his well-being.”  The two doctors charged in the case both surrendered their DEA licenses and can no longer prescribe controlled substances.      

In a recent appearance on CBS’ Face the Nation, DEA Administrator Anne Milgram likened Perry’s death to the opioid crisis, claiming that his doctors were ultimately responsible.  

“It started with two unscrupulous doctors who were violating their oath, which is to take care of their patients, and instead supplying Matthew Perry with enormous quantities of ketamine in exchange for huge amounts of money. And then it switched to the street where Matthew Perry was buying the ketamine from two drug traffickers,” Milgram said.

“Every single day, (we) are targeting and investigating doctors, nurse practitioners, others who are violating this duty of trust to their patients by over prescribing medicine or prescribing medicine that isn't necessary.”

Milgram also claimed that ketamine “has a high potential” for addiction. While experts agree the drug can be abused, ketamine is not an opioid and does not suppress respiration, the leading cause of an overdose.  

Patients Should Know the Health Benefits of Ketamine, Not Just the Risks

By Drs. Amber Borucki and Rakhi Dayal 

Recent headlines about the death of “Friends” actor Matthew Perry have pointed to ketamine as a contributing cause. Perry drowned in his hot tub last October, which the medical examiner’s office attributed to the “acute effects of ketamine,” as well as coronary artery disease and the opioid buprenorphine.

With this news, the public became more familiar with a medication they may never have heard of previously.  Ketamine is a classified by the Drug Enforcement Administration (DEA) as a “dissociative anesthetic,” meaning that it can cause the user to feel disconnected and alter their perceptions of sight or sound. 

Ketamine is used in hospital or surgical settings for anesthesia purposes, for acute pain management, in the emergency room or intensive care, and in some cases for chronic pain management. A form of ketamine (esketamine) is also used to treat mental health conditions. 

Appropriate monitoring and medical supervision are necessary for safe ketamine use. While it is important to recognize the risks of this medication when used improperly, it is also important to make sure that people don’t become overly fearful of a drug that serves an important role in patient care when delivered properly by trained healthcare providers. 

When the news broke that Michael Jackson’s death was attributed to propofol, patients were suddenly concerned about the use of this drug in their anesthesia treatment. As physicians, it is our responsibility to make sure patients understand the proper and improper uses of medications, and that we help alleviate concerns through education. As with any treatment, we need to strike the right balance between providing information on the risks, while also communicating the benefits. 

While ketamine is in the spotlight and more stories are published about its use, it is important that we take a moment to provide greater clarity about this medication.  

What Is Ketamine?  

Ketamine is an anesthetic agent that was originally developed in 1963 and gained approval from the Food and Drug Administration (FDA) as a general anesthetic in 1970. It is well established that ketamine has tremendous clinical value in providing sedation and pain relief when patients undergo anesthesia, and can also be beneficial as part of a comprehensive pain management plan. More recently, the FDA approved a form of ketamine in a nasal spray for treatment-resistant depression.   

Ketamine is used for a variety of indications, with some being FDA-approved and some being considered "off-label" uses.  

• General anesthesia (FDA-approved): Ketamine can be used as part of a general anesthetic given for surgery, and in certain clinical situations is one of the preferred medications.  When ketamine is given by a trained anesthesia provider, it is a safe and effective part of the anesthesia regimen.     

• Acute pain (off-label): Ketamine can be given to treat pain after surgery or for other significant acute pain conditions. This is commonly done by providing a low-dose infusion of ketamine through an IV while a patient recovers in the hospital. Although this is considered "off-label” use, there are joint guidelines issued in 2018 by the American Society of Regional Anesthesia and Pain Medicine (ASRA), the American Society of Anesthesiologists (ASA), and the American Academy of Pain Medicine (AAPM) to guide safe use for acute pain.

• Chronic pain management (off-label): Ketamine for chronic pain is also considered "off-label" use, but there are also consensus guidelines by the ASRA, ASA and AAPM that discuss chronic pain clinical scenarios where research found ketamine to be beneficial. 

If a patient is considering the use of ketamine for chronic pain, it is important to understand what type of medical supervision is provided and by whom. Patients should consider seeking treatment from a physician who is board certified in pain medicine, as they have extra training in pain management. The use of ketamine for chronic pain should be part of a larger umbrella of comprehensive pain treatment strategies provided in a multidisciplinary care team model.

What Are the Risks of Ketamine?

Ketamine is classified a schedule III controlled substance by the DEA, and therefore has some addictive potential. Side effects include increased heart rate, high blood pressure, increased saliva production, blurry vision, dizziness, sedation, nausea, urinary symptoms, dissociation (out of body sensation) and respiratory depression. It can even cause hallucination at certain doses. 

Caution is advised when ketamine is used with other medications that have similar adverse effects, such as sedation, respiratory depression, confusion, and delirium. Medication interactions and overdose with ketamine can lead to unconsciousness, slowed breathing, and rare severe consequences such as death. 

The medical use of ketamine in general anesthesia under the medical supervision of a trained provider is generally considered safe. Off-label use of ketamine for acute and chronic pain also has established national guidelines for medical practitioners to follow. This treatment can provide pain relief to patients safely, when provided by a board-certified anesthesiologist or pain physician using proper monitoring and safety guidelines.

Unsupervised and non-medical use of ketamine, particularly when taken in combination with other sedating medications, can lead to adverse outcomes and even death, as we saw with Matthew Perry. We encourage patients to have conversations with providers about their treatment plan and to discuss any concerns they have about the medications they are prescribed.

Amber Borucki, MD, is an Associate Professor of Anesthesiology, Perioperative and Pain Medicine at Stanford University.

Rakhi Dayal, MD is Chair of the Pain Committee for the California Society of Anesthesiologists, and Program Director of Pain Medicine and Professor of Anesthesiology & Perioperative Care at University of California, Irvine.