Efficacy and tolerability of almotriptan in postmarketing surveillance studies

Abstract

While randomized, double-blind, placebo-controlled trials are considered the gold standard of clinical evidence, they are limited by patient numbers, duration of patient exposure, and restricted patient populations. Data from controlled trials may not be generalizable to all individuals likely to take the drug under investigation. Postmarketing surveillance studies are designed to measure efficacy and safety in larger and more diverse populations, allowing them to detect less common and delayed adverse events. However, postmarketing surveillance studies are limited by their lack of randomization, open-label design that can result in patient and physician bias, incomplete follow-up, less than rigorous outcome measurement, and lack of a contemporaneous control group. With regard to acute treatment of migraine, clinical trials using per protocol primary endpoints do not reflect the more favorable experience with triptans in general practice. Postmarketing surveillance studies have been performed to determine whether the high levels of efficacy and tolerability of almotriptan reported in controlled clinical trials can been reproduced in routine practice. An observational study conducted in Spain with 2,074 migraine sufferers (4,183 attacks) reported a 2-hour pain-relief rate of 86.9%, a 2-hour pain-free rate of 51.5%, and a sustained pain-free rate of 46.0%; 1.1% of patients reported adverse reactions. A German postmarketing study in 899 patients (2,131 attacks) with acute migraine treated with almotriptan 12.5 mg reported 2-hour pain relief in 84.5% of attacks and 2-hour pain free in 41.4%; 1.1% of patients reported adverse reactions. The consistency of response (at least two out of three attacks successfully treated) with almotriptan 12.5 mg was 87.3%. Regarding satisfaction, 88.5% of patients were satisfied or very satisfied and 80.3% of patients stated that almotriptan was better compared to their prior therapy; 92% of physicians indicated that they would continue treating their patients' migraines with almotriptan. The results of these studies demonstrate that the high levels of efficacy and tolerability seen with almotriptan in controlled clinical trials are achieved in real-world clinical settings. In conclusion, a combination of controlled clinical trials, postmarketing surveillance studies, and physician's experience in the general population can give us a better understanding of the efficacy and tolerability of acute migraine agents.