Evidence against a dependence of the senna effect on prostaglandin formation

The laxation induced by senna is not modified in rats either maintained on a diet deficient in essential fatty acids (EFAD) or exposed to cold (6 degrees C) or with yeast-induced fever. In light of our findings it appears conceivable that non-PG-mediated mechanism(s) play a relevant role in laxation induced by senna.