CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY
Nitroglycerin heart drug. Spray bottle of the cardiac drug glyceryl trinitrate (GTN), also known as nitroglycerin. GTN is a vasodilator (blood vessel widening) drug used to treat angina pectoris, pain due to the constriction of the cardiac arteries, and hypertension (high blood pressure).
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