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Why is senna a laxative?
Senna contains the main active ingredients sennoside A and sennoside B, both of which are converted to have a laxative effect by the action of enzymes from the colon.
Then the effect of stimulating the colon wall to cause compression. including inhibiting the reabsorption of water in the colon resulting in excretion
thanks for the source
1. Drug data warehouse unit Faculty of Pharmacy Mahidol University