The full name of B12 is Vitamin B₁₂, and the proper way to take the tablets is orally, 25-100 μg a day (1-4 tablets a day), or 50-200 μg every other day (2-8 tablets every other day), in divided doses as prescribed by the doctor. This product is often used in the treatment of megaloblastic anemia and other diseases. Oral administration of this product may lead to a decrease in blood potassium and hyperuricemia, etc. Injection administration may cause allergic reactions, rash, itching, allergic asthma, etc., which may lead to anaphylaxis in severe cases. Contraindications are unclear. Vitamin B₁₂ concentration in the blood should be monitored when available, because this product can lead to accelerated nucleic acid degradation and elevated blood uric acid, which may induce gout. Patients who need to use the drug should be under the guidance of a specialized physician and strictly comply with medical advice.