Chinese rhubarb contains the anthraquinone rhein, so higher doses have a stimulant laxative effect similar to that of cascara and senna. In contrast, lower doses have antidiarrheal effects because tannins (5% and 10%) in the herb have astringent effects. Laxative effects generally occur 6 to 10 hours after ingestion. Chinese rhubarb may increase cardiac contractility,
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