Dong quai is a plant. People use the root to make medicine. Dong quai is used for menstrual cramps, premenstrual syndrome (PMS), and menopausal symptoms. It is also used orally as a ”blood purifier”; to manage hypertension, infertility, joint pain, ulcers, “tired blood” (anemia), and constipation; and in the prevention and treatment of allergic attacks. Dong quai is also used orally for the treatment of loss of skin color (depigmentation) and psoriasis.