Separate leaves of cultivated shrubs of cassia acutifolia and cassia angustifolia. Contains emodin, chrysophanic acid. The laxative effect is similar to the effect of rhubarb preparations. It is well tolerated, due to the low content of resinous substances it does not irritate the intestines. Relaxation occurs after 6-10 hours. The following senna preparations are used:
Water infusion of 5-10 g of senna per 100 ml of water, appoint 1 tablespoon 1-2-3 times a day.