Vitamin B2, also known as riboflavin, is yellow in color itself, so the urine will appear yellow after taking the medication and will not affect the continuation of the medication. Vitamin B2 is available in oral and injectable forms for the prevention and treatment of vitamin B2 deficiencies such as xerostomia, dry and cracked lips, labial inflammation, scrotal inflammation, conjunctivitis, and seborrheic dermatitis. The drug should be taken about 30 minutes after a meal for oral administration, which is more conducive to the absorption of the drug. Alcohol affects the absorption of vitamin B2, so avoid drinking alcohol while taking the medicine. Vitamin B2 is a water-soluble vitamin that does not easily accumulate in the body and is safe to use at regular doses. The main clinical use is oral preparation, injection because it contains benzyl alcohol, so it is prohibited for children’s intramuscular injection, because benzyl alcohol can cause children’s gluteal muscle spasm.