Separate leaves of cultivated shrubs of Norway cassia and narrow-leaved cassia. Contains emodin, chrysophane acid. The laxative effect is similar to the effect of rhubarb preparations. Well tolerated, due to the low content of resinous substances does not irritate the intestines. Relief occurs in 6-10 hours. The following senna preparations are used:
Water infusion of 5-10 g of senna per 100 ml of water is prescribed 1 tablespoon 1-2-3 times a day.