Vitamin B₂ tablets do not have three major contraindications to taking them, the contraindications are mainly prohibited for those who are allergic to the drug components. Vitamin B₂ tablets are B vitamins, clinically used mainly for the prevention and treatment of vitamin B₂ deficiencies, such as xerostomia, dry and cracked lips, lingual inflammation, scrotal inflammation, conjunctivitis, seborrheic dermatitis and so on. Adverse reactions are usually not toxic under normal renal function, and yellow coloration of urine may occur after taking the drug, but it does not affect the use of the drug. Allergic to the drug is prohibited. Drug interactions: alcohol consumption will affect the intestinal absorption of vitamin B₂; should not be combined with metoclopramide; with phenothiazines, tricyclic antidepressants, vitamin B₂ dosage needs to be increased. If you need to use the drug is recommended to consult a doctor for examination, the drug should be used under the guidance of a professional doctor.