Vitamin B12 injection is mainly used for megaloblastic anemia, and also used as an adjunctive treatment for neuritis. Intramuscular injection, adults, 1 day 0.025 ~ 0.1 mg or every other day 0.05 ~ 0.2 mg. When used for neuritis, the dosage may be increased. Vitamin B12 tablets, oral. 25-100 μg (1-4 tablets) a day or 50-200 μg (2-8 tablets) every other day, in divided doses or as directed by the doctor. Vitamin B12 is involved in the process of DNA synthesis in the body and has a therapeutic effect on megaloblastic anemia due to nuclear hypoplasia. When using this drug, in case of adverse reactions such as hypokalemia and hyperuricemia, it is recommended to stop using the drug and seek medical attention. The drug may cause allergic reactions, even anaphylactic shock, and should not be abused. When available, blood concentration of vitamin B₁₂ should be monitored during the course of administration. Hyperuricemia may occur with the use of this product in patients with gout. When using this drug, pay attention to monitoring blood potassium and other indicators. This drug should be used under the supervision of a clinician. Do not use without authorization.