Thiamine Oral: Vitamin B1 Dosing
Thiamine guidance for vitamin B1 deficiencies including beriberi and alcoholic neuritis.
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Guide category
Oral drugs
Safety boundary
Educational medicine information, not personal medical advice.
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Therapeutic action
Vitamin.
Indications
Vitamin B1 deficiencies: beriberi and alcoholic neuritis.
Forms and strengths
- 50 mg tablet.
- Also comes in 10 mg and 25 mg tablets.
Dose and duration
Infantile beriberi
- 10 mg once daily, until complete recovery, usually 3 to 4 weeks.
Acute beriberi
- 50 mg 3 times daily for a few days, until symptoms improve, then 10 mg once daily until complete recovery over several weeks.
Mild chronic deficiency
- 10 to 25 mg once daily.
Contra-indications, adverse effects, precautions
- No contra-indication or adverse effects with oral thiamine.
- Pregnancy: no contra-indication.
- Breast-feeding: no contra-indication.
- In the treatment of severe cases, injectable thiamine is justified initially but is no longer justified when symptoms have improved.
- Vitamin B1 deficiency often occurs in association with other vitamin B-complex deficiencies, especially in alcoholic patients.
Source
MSF Essential drugs practical guidelines (January 2026)
This page combines source-derived medicine reference sections with Kenza editorial context, while leaving out the Storage and Remarks sections from the source batch.
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