How many doses of Glyceryl Trinitrate (GTN) spray are used and what is it used for?

• A. 1 puff; Used for chest pain.
• B. 3 puffs; Used for high blood pressure.
• C. 2 puffs; Used for anxiety.
• D. 2 puffs under the tongue; Used for Angina, suspected heart attack.

Answer: (D)

Glyceryl trinitrate spray acts quickly because it’s taken under the tongue, where the medication is absorbed into the bloodstream fast to dilate blood vessels and relieve chest pain from angina. A single dose of two puffs is the standard initial amount, providing prompt relief of symptoms. This use extends to a suspected heart attack by helping to ease chest pain while emergency help is arranged. It’s not used to treat anxiety or to manage high blood pressure in this setting, and the typical emphasis in basic guidelines is on two puffs as the starting dose rather than one or three.