Glyceryl trinitrate (GTN): how to take it safely
GTN spray, Nitrolingual
Reviewed by Pharm. Abeeb Junior
What it is for
Quick relief of chest pain (angina).
How to take it
- Prescription medicine: take it exactly as your doctor or pharmacist told you.
- Sit down before using it.
- Spray under the tongue or place the tablet under the tongue, as your doctor showed you.
- Do not swallow it right away.
When to take it
Use it when angina starts, or just before activity that brings it on.
Take it with
Under the tongue.
What to avoid
- Sildenafil, tadalafil and similar medicines.
- Standing up quickly after using it.
- Using it more often than your doctor advised.
Possible side effects
Headache, flushing, dizziness, fast heartbeat.
Get help if
Chest pain that is not relieved after the doses your doctor advised, or that lasts more than 15 minutes: call emergency services.
This is general information, not personal medical advice. Always follow your doctor's or pharmacist's instructions and read the leaflet that comes with your medicine. Medicines and doses can differ between products and people.