A study coming out in tomorrow’s edition of Archives of General Psychiatry may prompt doctors and patients to reconsider the merits of using antiepileptic drugs to treat people with bipolar disorder.
Just last year, the U.S. Food and Drug Administration issued an alert that antiepileptic drugs -- such as Neurontin (generic name gabapentin), Lyrica (pregabalin), Topamax (topiramate) and Tegretol (carbamazepine) -- increased the risk of suicidal thoughts and behaviors. That’s particularly important for patients with bipolar disorder, because they already have a higher risk of suicide compared to healthy people.
But the new analysis finds that bipolar people who took one of 11 antiepileptic medications had the same rate of suicide attempts -- 13 per 1,000 patients per year -- as those who didn’t take any drugs for their condition. That rate was slightly lower than for bipolar people who took lithium (18 suicide attempts per 1,000 patients per year). It was also much lower than the rate of suicide attempts among bipolar people in the year before they began taking antiepileptic medications (72 per 1,000 patients per year).
The findings are based on records of 47,918 patients with bipolar disorder who were included in the PharMetrics medical claims database. The study was conducted by researchers from the Center for Health Statistics at the University of Illinois at Chicago and the Columbia University College of Physicians and Surgeons in New York. Two of the researchers have produced expert testimony for Pfizer Pharmaceuticals in litigation involving Neurontin. Pfizer purchased the dataset from PharMetrics for $15,000 but was not involved in the research and didn’t influence or review the results, according to the researchers.
-- Karen Kaplan
Photo: Perhaps this drug is safer, and more useful, than thought. Credit: Pfizer Inc.