The effect of sumatriptan in two standard algesimetric tests and in a model of cephalalgia was evaluated in rats. The pain threshold was measured by the hot-plate and the writhing tests; cephalalgia was produced by injecting bradykinin (10 μg in a volume of 10 μl) into a common carotid artery. Sumatriptan was subcutaneously (s.c.) injected at the doses of 4, 8, 24 or 42 mg/kg; morphine (5 or 10 mg/kg s.c.) and indomethacin (5 or 10 mg/kg s.c) were used as standard analgesic drugs. Sumatriptan had no analgesic activity either in the hot-plate test or in the writhing test. On the other hand, at 24 and 42 mg/kg it dose-dependently reduced the response to the intracarotid injection of bradykinin (vocalization and tachypnea), this effect being prevented by the 5-HT1B receptor antagonist, isamoltane. The 5-HT1D receptor antagonist BRL15572 prevented the effect of sumatriptan on bradykinin-induced tachypnea, but not the effect of sumatriptan on bradykinin-induced vocalization. These data demonstrate that sumatriptan is significantly effective in a reliable animal model of cephalalgia, while having no systemic analgesic activity

Effect of sumatriptan in different models of pain in rats / Ottani, Alessandra; Ferraris, E; Giuliani, Daniela; Mioni, C; Bertolini, Alfio; Sternieri, Emilio; Ferrari, Anna. - In: EUROPEAN JOURNAL OF PHARMACOLOGY. - ISSN 0014-2999. - STAMPA. - 497(2)(2004), pp. 181-186. [10.1016/j.ejphar.2004.06.053]

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