同仁堂 (Tóngréntáng) is a famous Chinese pharmacy founded in the early Qīng dynasty, providing Chinese medicine for the emperor’s family since 1723.
Tóngréntáng is a household name and sells medicines with ingredients based on a personalized recipe from a doctor. This could be plant material like ginger, cinnamon, goji berries, smoked plum, saffron, or sometimes animal products like donkey skin, cicadas and even category-defying creatures like the Chinese caterpillar fungus.
The doctor packs the ingredients in bags, each containing a daily dose, and the patient then grinds the ingredients at home and drinks it as tea once or twice a day.
Tóngréntáng also sells Western medicines, and indeed, younger Chinese audiences are less and less interested in the old herbal ways. The original shop still exists just south of Tiānānmén Square in Bĕijīng.
Lots of people swear by it. VisitBeijing.com