The harmful effects of moneywort are namely toxic side effects and adverse reactions that occur after taking the drug. There is no research to confirm the adverse reactions and toxic side effects of money grass, need to follow the doctor’s advice to standardize the use. Qianqian Cao is the dried whole grass of the primrose plant, its effects are diuresis, diuretic and diaphoretic (to improve the problem of dribbling in the urine, urinary volume and inability to pass) and detoxification and decongestion of the efficacy. It is mainly used in the treatment of jaundice due to dampness-heat, bile distension and coercive pain (pain in the area of coercion and ribs), feverish drenching (the patient mainly manifests symptoms of frequent urination, urgency of urination, pain in urination and blood in urination), venomous snake bites, carbuncle furuncle (sores that mostly occur on the limbs or the face, with the shape of a small root and as hard as nails), and stony drenching (the discharge of gravel in the urination or the sudden interruption of urination, with pain in the urinary tract, and intolerable colicky pains in the lower back and abdomen), and other conditions. Qianqian Cao can be used internally or externally, decocted for internal use, and pounded and applied externally. The adverse reactions and contraindications of Qianqian Cao are not clear. It should be noted that patients who experience uncomfortable symptoms when taking Qianqian Cao are advised to go to a regular institution for treatment to avoid delaying their condition.