Extended data Senna leaves, also known as Chen Na leaves, Senna leaves and soaked bamboo leaves, come from the leaflets of narrow-leaved Senna leaves or pointed-leaved Senna leaves of leguminous plants. Senna leaf, English name, is an irritating laxative, which stimulates intestinal peristalsis through intestinal mucosa and nerves. It's a powerful medicine. I suggest using it as little as possible. It acts on the colon and usually takes effect within a few hours.
References:
Baidu encyclopedia-senna leaf