About glyceryl trinitrate
Nitrate vasodilator
Used for
- Rapid relief of angina (chest pain)
- Prevention of angina before exertion
Usual adult dose
For an angina attack, place one tablet under the tongue; repeat every five minutes if needed, up to three tablets.
Common side effects
- Headache
- Dizziness or light-headedness
- Flushing
- Low blood pressure
Important warnings
- Do not swallow or chew; let the tablet dissolve under the tongue.
- Avoid sildenafil, tadalafil, vardenafil, or riociguat; the combination can dangerously lower blood pressure.
- Sit down before use because fainting may occur.
- Seek urgent help if chest pain persists after three doses over 15 minutes.
Pregnancy
Use only when clearly needed and prescribed; safety information is limited.
Breastfeeding
Use only when clearly needed and prescribed; information on transfer into breast milk is limited.
Interactions
- Sildenafil, tadalafil, vardenafil, and riociguat can cause severe low blood pressure.
- Alcohol and other blood-pressure-lowering medicines may increase dizziness or fainting.
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 It may be incomplete or out of date.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.