Migraine preventive drug-induced weight gain may be mediated by effects on hypothalamic peptides: the results of a pilot study.

AIMS: This study was aimed to verify changes in the levels of hypothalamic neuropeptides in migraineurs under preventive treatment with amitryptiline and flunarizine. Thirty-nine migraine patients with a body mass index <25 kg/m(2) and without endocrinological or metabolic diseases were assigned to two treatment groups, one receiving amitryptiline, the other flunarizine, for 3 months. Orexin-A, orexin-B and neuropeptide-Y plasma levels were measured at the basal time, at the 1st, 2nd and 3rd months of preventive treatment. RESULTS: A statistically significant reduction in plasma orexin-A and orexin-B levels emerged in both groups. Conversely, plasma neuropeptide-Y levels were markedly increased, with the highest levels at the 2nd and 3rd months, in both patient groups. Orexin-A levels were also negatively correlated to weight gain in both groups during the treatment period. CONCLUSIONS: These results suggest that changes in the levels of hypothalamic orexinergic peptides may contribute to body weight increase occurring in migraineurs during amitryptiline or flunarizine prophylactic treatment.