Huajin Vitamin B12 Tablets

1. Indications and Usage
Vitamin B12 Deficiency Anemia: Indicated for the prevention and treatment of megaloblastic anemia caused by vitamin B12 deficiency.
Neurological Disorders: Used as an adjunctive treatment for nerve damage associated with B12 deficiency, such as peripheral neuropathy.
Malabsorption Syndromes: Used in patients with conditions affecting B12 absorption, such as pernicious anemia or post-gastrectomy.
2. Dosage and Administration
Adults: The usual dosage for adults is 10–50 mcg daily, taken orally. For severe deficiency, doses up to 1000 mcg daily may be prescribed.
Children: Dosage for infants and children is typically 1–5 mcg daily, or 30 mcg once a week, depending on age and condition.
Administration: Can be taken with or without food. Sublingual formulations are also available for patients with absorption issues.
3. Mechanism of Action
DNA Synthesis: Vitamin B12 acts as a cofactor for the enzyme methionine synthase, which is essential for DNA synthesis and red blood cell formation.
Myelin Sheath Maintenance: It is crucial for the metabolism of fatty acids involved in the synthesis of the myelin sheath, protecting nerve cells.
4. Safety and Warnings
Hypersensitivity: Contraindicated in patients with a known hypersensitivity to cobalamin or any component of the formulation.
Leber’s Disease: Use with caution in patients with Leber’s optic atrophy, as B12 supplementation may cause severe optic nerve atrophy.
Potassium Levels: Rapid red blood cell production during treatment can cause hypokalemia, requiring monitoring.
5. Adverse Reactions and Clinical Research
Common Adverse Reactions: Mild diarrhea, itching, skin rash, and headache.
Serious Adverse Reactions: Severe hypersensitivity reactions, including anaphylaxis, are rare but possible.
Clinical Findings: Clinical studies confirm that oral B12 is effective in treating deficiency when taken in high doses, bypassing the need for intrinsic factor.
6. Drug Interactions
Chloramphenicol: May reduce the hematologic response to vitamin B12.
Colchicine: Can interfere with the absorption of vitamin B12 from the gastrointestinal tract.
Proton Pump Inhibitors: Long-term use may decrease B12 absorption by reducing gastric acidity.
7. Pharmaceutical Information
Active Ingredient: Vitamin B12 (Cyanocobalamin or Mecobalamin).
Strengths: Typically available as 10 mcg, 50 mcg, and 1000 mcg tablets.
Appearance: White or slightly yellowish tablets, often film-coated.
Storage: Store in a tight, light-resistant container, protected from moisture.