Vitamin B2 is taken orally, one to two tablets three times a day for adults and 0.5 to 1 tablet for children. Vitamin B2 needs to be taken as prescribed by a doctor, usually after a meal. Vitamin B2 can participate in the metabolism of sugar, protein and fat in the body; help maintain normal visual function; and also promote growth. In clinical practice, it is commonly used in the prevention and treatment of vitamin B2 deficiency and its complications, such as conjunctivitis, keratitis, laryngitis, dry and cracked lips, scrotal inflammation, seborrheic dermatitis and so on. When using vitamin B2, the specific dosage needs to follow the doctor’s instructions. It should be noted that, allergic to vitamin B2 is prohibited, should not be combined with metoclopramide and other drugs, if you are using other drugs, before using vitamin B2, please consult a physician. Taking vitamin B2 may cause the patient’s urine to appear yellow, this situation generally does not affect the treatment, drink more water, the symptoms will disappear after stopping the drug.