⚠️ Important: This information is for education only. Never start, stop, or change any medication without consulting your doctor. This is NOT a prescription.
Over-the-counter (OTC)H2 blocker
Ranitidine
Brand names
RantacAcilocZinetac
Uses
Acidity and ulcers (availability may vary by region).
How it works
Blocks H2 histamine receptors in the stomach, reducing acid.
Common side effects
- Headache
- Constipation
Serious side effects
- Rare blood or liver effects
Who should not take it
Known allergy.
Drug interactions
May affect absorption of drugs needing stomach acid.
Storage
Store below 25°C.
Pregnancy category
B — No evidence of risk in humans
Sources: British National Formulary