Senna Flower tea: Drinking Senna tea can help remove toxins from the body (detoxification), and also stimulate weight loss. Senna herb contains glycosides - a laxative compound that is smoothing for the stomach muscles and helps relieve constipation and digestion. How to use: Senna Tea Take one table spoon of (5 grams) of Senna powder put it in 1 cup of boiled water, cover and steep for 10 minutes, strain, and drink while hot. Flavor the tea with lemon or ginger as desired.