Almost 1.5 million Americans visit emergency rooms every year for the treatment of head trauma. Headache, not surprisingly, is one of the most common symptoms of head trauma. What is very surprising is that until now, there have been no controlled studies of acute therapies for posttraumatic headaches.
Dr. Benjamin Friedman and his colleagues at the Montefiore Hospital in the Bronx just published a “Randomized Study of Metoclopramide Plus Diphenhydramine for Acute Posttraumatic Headache” in the journal Neurology. Emergency rooms often use metoclopramide (Reglan) as the first-line drug for the treatment of migraines. Diphenhydramine (Benadryl) was added to reduce the chance of side effects from metoclopramide. These side effects of restlessness and involuntary movements can be very unpleasant.
The study involved 160 patients. Their pain severity was measured on a 0 to 10 verbal scale. Patients who received a placebo reported a mean improvement of 3.8, while those receiving two medications improved by 5.2 points. Side effects occurred in 43% of patients who received medications and 28% of patients who received placebo.
My recent post was devoted to a study that showed dramatic similarities between migraines and posttraumatic headaches. The outcome of Friedman’s study, therefore, is not unexpected.
The overall efficacy of metoclopramide is fairly modest. It provides only partial relief that often does not last. And some patients get no relief at all. It also causes unpleasant side effects.
It is puzzling why emergency room doctors are not using a migraine-specific drug, sumatriptan for both migraines and posttraumatic headaches. An injection of sumatriptan works well within an hour for 70% of migraine patients. It has significantly fewer side effects than metoclopramide. Vials of sumatriptan (but not autoinjectors) are relatively inexpensive.
As far as the use of sumatriptan for posttraumatic headaches, we have only a few anecdotal reports. One of the reports, however, describes seven patients who did not respond to other drugs and had very good relief of their posttraumatic headaches with sumatriptan.
