Adenosylcobalamin for injection is a vitamin B12 analogue that is often used clinically in the treatment of patients with megaloblastic anemia, or pernicious anemia. By administering adenosylcobalamin intramuscularly along with folic acid tablets, patients often experience a marked improvement in appetite within about 3 days. The patient’s anemia usually begins to improve after about 1 week of treatment, and megaloblastic anemia is usually cured after about 1 month of treatment. Therefore, the treatment of megaloblastic anemia or pernicious anemia with adenosylcobalamin for injection is very effective. In addition, adenosylcobalamin for injection can also maintain the integrity of the nerve tissue structure, and is commonly used in clinical practice to treat polyneuritis, radiculitis, trigeminal neuralgia, sciatica, nerve paralysis, etc. It also has good therapeutic effects.