Methylcobalamin is the active, coenzyme form of Vitamin B12, essential for neurological function, DNA synthesis, and red blood cell formation. The intranasal spray formulation offers a non-invasive, needle-free alternative for systemic delivery, bypassing the gastrointestinal tract and potential absorption issues related to intrinsic factor or gut pathology. It is particularly relevant in the Indian context for managing B12 deficiency in patients with malabsorption syndromes, pernicious anemia, and neuropathic conditions.
Adult: For deficiency: 1 spray (250 mcg) in one nostril, once daily. For maintenance: 1 spray (250 mcg) in one nostril, 2-3 times per week or as directed. Alternate nostrils for daily dosing.
Note: 1. Blow nose gently if congested. 2. Shake the bottle gently. 3. Prime the pump by spraying into the air 5-6 times before first use or if unused for >7 days. 4. Tilt head slightly forward. Insert nozzle into nostril, pointing away from the nasal septum. 5. Breathe in gently through the nose while pressing down firmly on the pump to release the spray. 6. Avoid sneezing or blowing nose for a few minutes. Do not rinse the spray tip with water.
Methylcobalamin serves as a coenzyme for two crucial reactions: 1) Methionine Synthase: Catalyzes the conversion of homocysteine to methionine, which is essential for DNA/RNA synthesis, myelin formation, and neurotransmitter balance. 2) L-Methylmalonyl-CoA Mutase: Converts methylmalonyl-CoA to succinyl-CoA, a key step in lipid and carbohydrate metabolism within the mitochondria. Its role in these pathways supports hematopoiesis, neuronal integrity, and cellular energy production.
Pregnancy: Category A (US FDA). Considered safe. Methylcobalamin crosses the placenta. Supplementation is recommended in deficient mothers to prevent neural tube defects and support fetal development. Dose: As per adult recommendation.
Driving: No known effects. However, dizziness (a rare side effect) should be considered.
| Chloramphenicol | May decrease the hematological response to Methylcobalamin. | Moderate |
| Proton Pump Inhibitors (Omeprazole, Pantoprazole) | Long-term use can cause B12 deficiency, but does not affect intranasal absorption directly. Co-administration is therapeutic. | Minor |
| Metformin | Can reduce intestinal B12 absorption. Intranasal route bypasses this interaction, making it a preferred option. | Moderate (for oral B12) |
| Aminoglycosides, Colchicine, Slow-K (Potassium) | May reduce intestinal absorption of oral B12. Not relevant for intranasal route. | Minor |
| Folic Acid | Synergistic in treating megaloblastic anemia. Folic acid alone may mask B12 deficiency, allowing neurological damage to progress. | Major (if B12 deficiency is untreated) |
Same composition (Methylcobalamin (250mcg/spray)), different brands: