1. Clinical Overview
A fixed-dose combination of water-soluble B-complex vitamins and a provitamin of pantothenic acid, formulated for the nutritional management and treatment of neuropathic pain, vitamin B deficiencies, and related conditions. It is widely used in the Indian market for its neurotropic and metabolic actions.
| Onset | Duration | Bioavailability |
|---|---|---|
| Thiamine: 1-2 hours (subjective improvement); Neuropathic pain relief: 2-4 weeks of regular therapy. | Variable; due to water-soluble nature, regular supplementation is required. Effects may last for 24-48 hours post-dose. | Thiamine: ~5% (oral, dose-dependent saturation); Pyridoxine: ~75-90%; Methylcobalamin: Variable, ~1-3% (oral) but higher via parenteral; Nicotinamide: Nearly 100%; D-Panthenol: Rapidly converted to pantothenic acid with high bioavailability. |
2. Mechanism of Action
Combined action of essential cofactors in carbohydrate metabolism (B1), amino acid and neurotransmitter synthesis (B6), myelin synthesis and nerve regeneration (B12), cellular respiration (Nicotinamide), and coenzyme A synthesis for fatty acid metabolism (D-Panthenol). Synergistically supports nerve health and energy production.
3. Indications & Uses
- Nutritional deficiency of B-complex vitamins
- Diabetic peripheral neuropathy (symptomatic management)
- Alcoholic neuropathy
- Peripheral neuritis of mixed etiology
- Neurological manifestations of vitamin B deficiency (e.g., paresthesia, burning feet)
4. Dosage & Administration
Adult Dosage: Typically 1 injection (2ml ampoule) intramuscularly or deep subcutaneous, once daily or on alternate days initially, followed by 1-2 times per week as maintenance. Oral formulations: 1 tablet/capsule once or twice daily. MUST follow specific brand prescribing information.
Administration: For Injection: Administer by deep intramuscular (IM) or slow intravenous (IV) route as per brand instructions. Avoid subcutaneous route for volumes >1ml. For Oral: Take with or after food to minimize gastric discomfort. Do not crush or chew sustained-release formulations.
5. Side Effects
Common side effects may include:
- Pain, redness, or induration at injection site
- Mild nausea
- Headache
- Flushing (especially with Nicotinamide)
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Levodopa | Pyridoxine (>5mg) can increase peripheral decarboxylation of Levodopa, reducing its central efficacy in Parkinson's disease. | Major |
| Phenytoin / Phenobarbitone | Pyridoxine may decrease serum levels of these anticonvulsants. | Moderate |
| Isoniazid, Cycloserine, Penicillamine | These drugs are pyridoxine antagonists and can increase requirement for B6. | Moderate |
| Chloramphenicol | May antagonize the hematopoietic response to Vitamin B12. | Moderate |
| Proton Pump Inhibitors (e.g., Omeprazole) | Long-term use can reduce absorption of Vitamin B12. | Moderate |
7. Patient Counselling
- Do take the medication as prescribed, usually with food.
- Do inform your doctor if you are taking Levodopa for Parkinson's.
- Do attend regular follow-ups to monitor neurological symptoms.
- Don't self-medicate or exceed the prescribed dose.
- Don't stop medication abruptly if taken for a long period without consulting your doctor.
8. Toxicology & Storage
Overdose: Acute overdose is unlikely due to renal excretion. Chronic mega-doses: B6 (>1000 mg/day): Severe sensory neuropathy, ataxia. B1: Anaphylaxis (IV). Nicotinamide: Liver toxicity, hyperglycemia, peptic ulcer.
Storage: Store below 30°C. Protect from light and moisture. Keep out of reach of children. Do not freeze injections. For ampoules: Use immediately after opening. Do not use if solution is discolored or contains particulate matter.