Ketamine Nasal Spray May Be Effective Migraine Treatment

By Pat Anson, PNN Editor

In recent years, ketamine has become a trendy drug for treating depression, anxiety, post-traumatic stress and some types of chronic pain. Usually administered by infusion or injection, ketamine is a non-opioid analgesic that acts on the brain by putting patients into a temporary dream-like state.

A new study at Thomas Jefferson University suggests that ketamine may also be an effective treatment for chronic migraine. Several previous trials have shown that intravenous ketamine is effective for chronic headache, but it required close monitoring by a pain specialist to adjust the dose and monitor any side effects.

In the new study, researchers gave 169 migraine patients a ketamine nasal spray that they could use at home without supervision. Over two-thirds of the participants suffered from daily headaches and nearly 85% had tried over 3 types of migraine prevention drugs, with limited success.

The study findings, published in the journal Regional Anesthesia & Pain Medicine, showed that nearly half the participants said the nasal spray was “very effective” and about 40% found it “somewhat effective.” Over a third said their quality of life was “much better.” 

Nearly 3 in 4 patients reported at least one side effect from ketamine, the most common being fatigue and double/blurred vision, followed by cognitive effects such as confusion, dissociation, vivid dreams and hallucinations. Most of the side effects were only temporary.

“In this descriptive study, intranasal ketamine served as an acute treatment for refractory chronic migraine by reducing headache intensity and improving quality of life with relatively tolerable adverse events. Most patients found intranasal ketamine effective and continued to use it despite these adverse events,” wrote lead author Michael Marmura, MD, Outpatient Director at the Jefferson Headache Center.

Marmura and his colleagues are cautious about who should use ketamine because of its potential for abuse. Ketamine has a short half-life of less than two hours, meaning patients may be tempted to use it repeatedly to keep chronic headaches at bay. Patients in this study used the nasal spray an average of just 6 times a month, but a small number (13.9%) used the spray daily.

“Clinicians should only consider the use of a potentially addictive medication such as ketamine for significantly disabled patients with migraine,” they warned. “(This) should be addressed carefully and individually, as some may respond only to repeated ketamine, while some may overuse it.”

In 2019, the FDA approved the use of Spravato, a nasal spray that contains a ketamine-like substance, for severe depression. Because of the risk of abuse, Spravato can only be administered in a doctor’s office, where patients can be observed for two hours after taking a dose. The use of such a spray to treat migraine would be considered an off-label use.

In addition to its medical uses, ketamine has long been known as a party drug – “Special K” -- because it can cause hallucinations and intense, dream-like states.

It didn’t take long for drug dealers to note the increase in ketamine’s popularity. Recent research published in JAMA shows that seizures of illicit ketamine in the U.S. have risen from 55 seizures in 2017 to 247 in 2022, a 350% increase. Because much of its was seized in powder form, researchers are concerned black market ketamine could easily be adulterated with illicit fentanyl.

FDA Approves Cocaine Nasal Spray

By Pat Anson, PNN Editor

FDA advisory committees have taken a dim view of opioid medications recently, soundly rejecting new drug applications for the “opioid of the future” oxycodegol and a new extended-release version of oxycodone.

There was also a split 13-13 vote on a relatively mild opioid painkiller – a combination of tramadol and the anti-inflammatory drug Celebrex..

Advisory committee recommendations are not binding on the FDA, but the votes reflect a growing reluctance to approve any new medication that may worsen the so-called opioid epidemic.

"We can't approve a drug in the midst of a public health crisis," said advisory committee member Steve Meisel, PharmD, who voted no on oxycodegol.

FDA advisors may be rejecting opioids out of hand, but cocaine is a different story. The agency this month quietly approved a nasal solution containing cocaine hydrochloride (HCI) for use as a local anesthetic. The nasal spray, made by the Lannet Company, is intended to relieve pain in mucous membranes during surgeries and procedures in the nasal cavities of adults.

"The FDA's approval of our Cocaine HCl product, the first NDA approval to include full clinical trials in the company's history, marks a major milestone in Lannett's 70+ years of operations," said Tim Crew, chief executive officer of Lannett in a news release.

"We believe the product has the potential to be an excellent option for the labeled indication. We expect to launch the product shortly, under the brand name Numbrino."

Numb-rino. Get it?

While cocaine is well-known as a drug of abuse, it is classified by the DEA as a Schedule II controlled substance, alongside hydrocodone and oxycodone. Cocaine’s use in medicine is not unheard of. It was commonly used as an alternative to morphine in the last half of the 19th Century until it fell out favor because of high rates of addiction.

Numbrino is not the first nasal spray containing cocaine to be approved by the FDA. In 2017, the agency approved the nasal solution Goprelto, which is also intended for use during surgeries and procedures in nasal cavities. 

Nevertheless, the FDA’s approval of a drug containing cocaine was so unusual that Snopes conducted a fact check to see if it was true. An FDA spokesperson confirmed to Snopes that Numbrino was approved, along with warning labels and other safeguards to discourage its abuse.

“Cocaine hydrochloride nasal solution contains cocaine, a Schedule II substance with a high potential for abuse. However, when used according to the directions provided in the labeling, physical dependence and withdrawal symptoms are unlikely to develop because this drug is for single use during diagnostic procedures and surgeries,” the FDA said.

“To minimize these risks, the labeling suggests that health care facilities using the drug implement effective accounting procedures, in addition to routine procedures for handling controlled substances. Notably, this will be used as an anesthetic by trained health care professionals during diagnostic procedures and surgeries, not by patients directly. It is not available by prescription.”

Numbrino was approved without any of the controversy that surrounds opioid painkillers. In 2018, the FDA’s approval of Dsuvia — a single use opioid intended for severely wounded soldiers and trauma patients — was panned by critics, who called the drug a “dangerously unnecessary opioid medication." Like Numbrino, Dsuvia is not available by prescription and can only be administered by a healthcare professional.