What are the contraindications for eating Polygonum multiflorum

Polygonum multiflorum is a kidney medicine, its main function is to tonify liver and kidney, benefit essence and blood, moisten intestines and relieve constipation, often used to improve soreness of the waist and knees, impotence and premature ejaculation, tinnitus, dizziness, palpitations, insomnia, early white hair and other performance caused by insufficient liver and kidney essence and blood. Because polygonum multiflorum has certain toxicity, it must strictly follow the doctor's advice to control the dosage.