About verapamil
Calcium channel blocker; antiarrhythmic
Used for
- High blood pressure
- Angina (chest pain)
- Certain abnormal heart rhythms
Usual adult dose
Usually 120–240 mg once daily for high blood pressure or angina; rhythm-treatment doses vary.
Usual dose in children
Specialist-prescribed doses vary by age, weight, and condition.
Common side effects
- Constipation
- Dizziness or headache
- Slow heartbeat
- Low blood pressure
Important warnings
- Can worsen heart failure or cause dangerously slow heartbeat.
- Do not stop suddenly without medical guidance.
- Swallow extended-release tablets whole; do not crush or chew.
- Liver disease and older age may require lower doses.
Pregnancy
Use only when a clinician considers it necessary; pregnancy safety evidence is limited.
Breastfeeding
Small amounts enter breast milk; generally considered compatible, with infant monitoring for unusual sleepiness or feeding problems.
Interactions
- Beta-blockers can excessively slow heart rate or weaken heart function.
- Grapefruit may increase verapamil levels.
- Digoxin levels may rise.
- Some statins and other medicines can interact; interaction checks are important.
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 It may be incomplete or out of date.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.