About niacinamide
Vitamin B3 (nicotinamide)
Used for
- Prevents and treats niacin deficiency, including pellagra.
- Used under medical supervision for selected skin conditions.
Usual adult dose
For deficiency, commonly 100–300 mg daily in divided doses; treatment depends on the cause.
Usual dose in children
For deficiency, dosing is based on age and clinical need; a clinician determines the dose.
Common side effects
- Nausea or stomach discomfort
- Headache
- Rash or itching
- High doses may affect the liver or blood sugar
Important warnings
- High doses can cause liver injury; avoid unsupervised prolonged use.
- Seek medical guidance if taking it for a diagnosed deficiency or skin condition.
- People with liver disease or diabetes may need monitoring.
Pregnancy
Normal dietary amounts are important in pregnancy; medicinal doses should be guided by a healthcare professional.
Breastfeeding
Normal dietary amounts are compatible with breastfeeding; medicinal doses should be guided by a healthcare professional.
Interactions
- High doses may increase bleeding risk with anticoagulant medicines.
- May affect blood sugar control in people using diabetes medicines.
- Tell a clinician about other vitamins or supplements to avoid excessive intake.
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.