Vitamin B1, B6 & B12: Uses, Dosage, Side Effects & Brands | MedexInfo

Vitamin B1, B6 & B12

OTC / Rx

Therapeutic ClassVitamin Supplement / Neurotropic Vitamin Combination

Common DoseB1: 50–100 mg, B6: 10–50 mg, B12: 1000 mcg weekly (oral or injection as per condition)

PregnancyCategory A

Indications ▼

Vitamin B1, B6, B12 deficiency prevention and treatment

Peripheral neuropathy and neurological disorders

Supportive therapy in anemia (especially megaloblastic anemia)

Postoperative recovery and malabsorption syndromes

Mechanism & Pharmacokinetics ▼

Mechanism: B1 (Thiamine) acts as a coenzyme in carbohydrate metabolism; B6 (Pyridoxine) is essential for amino acid metabolism and neurotransmitter synthesis; B12 (Cobalamin) is vital for DNA synthesis, red blood cell formation, and neurological function.

Pharmacokinetics: Oral absorption in small intestine; widely distributed; B12 binds intrinsic factor for absorption; metabolized minimally; excreted in urine (B1 & B6) and bile (B12). Half-lives vary: B1 ~1–12 hr, B6 ~25–33 days, B12 ~days to months depending on depot storage.

Dosage & Administration ▼

Patient Category	Recommended Dose	Max / 24h
Adults	B1: 50–100 mg, B6: 10–50 mg, B12: 1000 mcg weekly	As per clinical need
Children	B1: 10–25 mg, B6: 1–5 mg, B12: 10–100 mcg	As per weight/clinical condition
Pregnant / Lactating	Standard prophylactic dose; adjust per doctor	Do not exceed recommended daily intake

Side Effects ▼

Common: Mild nausea, headache, gastrointestinal upset

Occasional: Allergic skin reactions, itching, redness

Rare: Neurological hypersensitivity, anaphylaxis with injectable forms

Contraindications ▼

Hypersensitivity to any component (B1, B6, or B12)

Severe renal impairment for high-dose B6 (risk of neuropathy)

Drug Interaction ▼

Levodopa: B6 may reduce efficacy of levodopa

Phenytoin, Isoniazid: may increase B6 requirement

Metformin, PPIs: may reduce B12 absorption

Pregnancy & Lactation ▼

Category A: considered safe in recommended doses

Excreted in breast milk in small amounts; generally safe

Clinical / Research Summary ▼

Deficiency Correction: Effective in correcting vitamin B deficiencies and preventing neurological complications.

Neuropathy Management: Supports nerve regeneration and reduces neuropathic pain in diabetic or alcoholic neuropathy.

Anemia Support: Improves hematological parameters in megaloblastic anemia and other B-vitamin deficient states.

Safety Profile: Generally well-tolerated at recommended doses; high-dose B6 for prolonged periods may cause neuropathy.

Patient Counseling Points ▼

How to take: Take as directed, orally or injection as prescribed

Missed dose: Take as soon as remembered, do not double dose

Possible side effects: Mild GI upset, headache; report allergic reactions

Monitor: Neurological symptoms with high-dose B6; hematologic response

Drug interactions: Inform doctor about other medications like levodopa or metformin

Lifestyle advice: Maintain balanced diet, alcohol moderation

Pregnancy and safety: Safe in recommended doses; consult physician if unsure

Storage & Handling ▼

Store at 20–25°C; protect from moisture & light

Keep out of reach of children

Brand Names (Bangladesh & Global) ▼

Bangladesh (Local Brands):

Neuro-B B-Complex

Global / International Brands:

Neurobion Beviplex

Medical Disclaimer: This clinical summary is for informational purposes only. Always follow guidance from a qualified healthcare professional for dosage, interactions, and use.

Reference Hubs:

• Drug Class: Vitamin B Complex • Conditions: Peripheral Neuropathy & Anemia • Pathway: B1/B6/B12 Metabolism & Nerve Function • Clinical Evidence & Trials