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Potentiation of analgesia and reversal of tolerance to morphine by calcium channel blockers.
Indian J Exp Biol ; 2001 Jul; 39(7): 636-42
Artículo en Inglés | IMSEAR | ID: sea-60173
ABSTRACT
Effect of four calcium channel blockers (CCBs) belonging to different chemical classes, alone and in combination with morphine was investigated on two models of pain sensitivity, i.e. formalin and tail flick tests in mice. All the studied CCBs, i.e. diltiazem, flunarizine, nimodipine and verapamil inhibited formalin-induced pain responses; however, with verapamil, though there was a trend towards a reduction of paw-licking response to formalin, it was not found to be statistically significant. In contrast, none of the CCBs affected the tail flick latency at any of the doses studied. Morphine, a mu-receptor agonist exerted a significant analgesic effect in formalin as well in tail flick tests. Pretreatment with all CCBs significantly enhanced the analgesic effect of morphine in both tests of nociception. Further, concomitant administration of one of the CCBs, diltiazem with morphine prevented the development of tolerance to the latter. However, combination of diltiazem with morphine, like morphine alone was found to be ineffective in morphine tolerant animals. Results, thus, show that CCBs produced an analgesic effect of their own in formalin-induced tonic pain and potentiated the analgesic activity of morphine. They also modulated opioid-induced tolerance.
Asunto(s)
Texto completo: Disponible Índice: IMSEAR (Asia Sudoriental) Asunto principal: Femenino / Masculino / Bloqueadores de los Canales de Calcio / Diltiazem / Flunarizina / Verapamilo / Nimodipina / Umbral del Dolor / Interacciones Farmacológicas / Tolerancia a Medicamentos Idioma: Inglés Revista: Indian J Exp Biol Año: 2001 Tipo del documento: Artículo

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Texto completo: Disponible Índice: IMSEAR (Asia Sudoriental) Asunto principal: Femenino / Masculino / Bloqueadores de los Canales de Calcio / Diltiazem / Flunarizina / Verapamilo / Nimodipina / Umbral del Dolor / Interacciones Farmacológicas / Tolerancia a Medicamentos Idioma: Inglés Revista: Indian J Exp Biol Año: 2001 Tipo del documento: Artículo