Treating Migraines with Codeine, Oxycodone or Barbiturates Increases Risk of Chronic Migraine
Treating migraine episodes with opioids or barbituates as few as eight times a month doubles the risk of developing chronic migraine. I’m in a Phenergan fog, so I’ll let the American Academy of Neurology‘s press release tell the story:
Overuse of Codeine, Oxycodone and Barbiturates Increases Risk of Chronic Migraine
People who overuse barbiturates and opioids, such as codeine, butalbital, and oxycodone, to treat migraine are at an increased risk of developing chronic migraine, according to research that will be presented at the American Academy of Neurology 60th Anniversary Annual Meeting in Chicago, April 12–19, 2008. People with chronic migraine have headaches on 15 or more days a month.
For the study, 24,000 people with headaches in the United States were surveyed about the types of medications they use to treat their headaches. From this sample of people with headache, the researchers selected those who had been diagnosed in 2005 with episodic migraine (fewer than 15 days of headache per month). Their risk of chronic migraine was then calculated based on the types of medications they used in 2005. Among those with episodic migraine in 2005, 209 people had developed chronic migraine in 2006.
The study found people who took drugs containing barbiturates or opioids for only eight days a month were twice as likely to develop chronic migraine a year later as those who didn’t take such drugs. [emphasis mine]
“People who use drugs that contain barbiturates and opioids, if only for a total of seven to eight days a month, appear to significantly increase their risk of migraine progression,” said study author Marcelo Bigal, MD, PhD, with Albert Einstein College of Medicine in Bronx, New York. “Strict limits for these types of drugs should be enforced among people with migraine as a way of preventing their migraines from becoming more frequent and more painful.”
The study found no evidence that the risk of developing chronic migraine increased among people who frequently used triptans, which are commonly prescribed drugs to treat migraine, or non-steroidal antiinflammatory drugs (NSAIDs), such as aspirin, ibuprofen and naproxen.
The study was supported by the National Headache Foundation.
Another interesting conundrum of treating pain with opioids: Opioids appear to change the brain so that the patient actually becomes more sensitive to pain. Building tolerance is not only your body getting use to the drug (called desensitization), but you actually become more sensitive to pain overall (referred to as sensitization), not just the pain that you are specifically treating. Treating Pain With Opioids has information on this research.