Glyceryl trinitrate, or GTN, is a type of medicine called nitrate. It is used to treat angina (chest pain).
It can help stop chest pain if an angina attack has already started. It can also help to prevent them from starting.
It comes as tablets or as a spray that you put under your tongue. It also comes as patches and ointment that you put on your skin.
Sometimes GTN patches are used in hospitals to make it your veins easier to see if you need to have a drip (infusion).
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