Vitamin B2 usually refers to vitamin B2 tablets, and there are no clear rules on how long it is appropriate to take them. However, the medication must be taken in the recommended dosage, not in excess, and medical advice must be strictly followed during administration. Vitamin B2 tablets can be used to treat and prevent discomforts caused by vitamin B2 deficiency, such as seborrheic dermatitis, conjunctivitis, scrotal inflammation and chapped lips. The medication should be taken orally, but the exact dosage and duration of administration should be determined by a medical professional, taking into account the physical condition of the body and the symptoms it exhibits. The contraindications of the drug are not clear. In the normal kidney function state almost does not produce toxicity, after taking the urine may be yellowish, but will not affect the health of the body, you can continue to use the drug treatment. When taking the drug, try to choose to take it after meals, the period of use of the drug must be taken in accordance with the dose recommended by the doctor, not overdose. Children’s dosage must be consulted with a specialized physician or pharmacist. It is contraindicated for those who are allergic to the product, and should be used with caution by those with allergies. Children must be used under adult supervision.