The correct name of vb2 is Vitamin B2 Tablets, taking Vitamin B2 Tablets under normal renal function state hardly produces toxicity or causes side effects, the urine is yellow after taking it, but it does not affect the continuation of the medication. Vitamin B2 tablets are mainly used for the prevention and treatment of vitamin B2 deficiency, including xerostomia, dry and cracked lips, lingual inflammation, scrotal inflammation, conjunctivitis, seborrheic dermatitis and so on. The contraindications of vitamin B2 tablets are not clear, but it should be noted that patients who are allergic to vitamin B2 tablets are prohibited, patients who are prone to allergies should be cautious, drinking alcohol (ethanol) will affect the intestinal absorption of vitamin B2, and this drug should not be used in conjunction with metoclopramide (Gastroflexan). If you need to use vitamin B2 tablets patients, it is recommended to consult a professional doctor, follow the doctor’s instructions standardized treatment, not blindly use their own medicine.