November 18, 2008 — (BRONX, NY) — A team of researchers led by investigators at the Albert Einstein College of Medicine of Yeshiva University has determined that certain commonly-prescribed medications may have the unintended consequence of increasing the frequency of migraine attacks. This important finding could alter the way doctors prescribe migraine medicines.
In a recent article published in the journal Headache, the Einstein-led study of more than 8,000 migraine sufferers nationwide, found that the use of medications containing barbiturates or narcotics — which relieve migraine short-term — may make migraine worse if these medications are overused. Treatment with these classes of medicines was associated with an increased risk of transformed migraine (TM) headaches, a form of migraine characterized by 15 or more days of headache per month.
The finding is significant because 35 million Americans suffer from migraine headaches and an additional 5 million suffer from transformed migraine. Migraine symptoms include throbbing head pain, most commonly on one side. The pain can worsen with physical activity. Attacks most commonly last from 4 to 72 hours, but may persist for longer. More severe attacks are overwhelming and hinder daily activities. In addition to personal suffering, lost labor costs in the U.S. due to migraine are in excess of $13 billion per year according to an earlier study from the Einstein team.
Principal investigator and senior author of the study, Richard Lipton, M.D. noted, "This confirms the longstanding feeling among many doctors that certain medications used to treat migraine may increase the frequency of headaches if overused. These findings have important public health implications." Dr. Lipton is professor and vice chair of neurology at Einstein and also directs the Montefiore Headache Center.
The objective of the study was to assess the role of specific classes of acute medications in the development of transformed migraine (TM) in people with episodic migraine (EM). In the study, 8,219 people with episodic migraine were followed for one year; 2.5% developed chronic migraine (TM) over the course of the year. The use of commonly prescribed medications, particularly narcotics (such as acetaminophen with codeine or Percocet), or barbiturates (such as Fiorinal, Fioricet and Esgic) were associated with a dose-dependent increased risk of new onset of chronic migraine (TM). That means episodic or occasional migraine sufferers who took narcotics or barbiturates more frequently were more likely to develop transformed migraine.
Conversely, for those study participants that suffered less than 10 headaches per month (EM sufferers), a class of drugs called triptans — known to relieve migraine — did not increase the risk of transformed migraine. NSAIDs (ibuprofen and naproxen sodium, for example) were protective against transition to TM for those suffering less than 10 headache days per month, but were associated with increased risk of transition to TM for those with high levels of monthly headache days.
"Proper treatment with the appropriate medicines can bring relief to most people with migraine," said Dr. Lipton. "Primary care practitioners and patients should try to avoid the use of narcotic or barbiturate medications that may exacerbate migraine; if these drugs are necessary, patients should be advised of the risks of medication overuse and dose limits should be applied."
The American Migraine Prevalence and Prevention Study is funded through a research grant to the National Headache Foundation from Ortho-McNeil Neurologics, Inc., Titusville, New Jersey. The study won the 2008 Harold Wolff Award for excellence in headache research, a prize given by the American Headache Society.