Explanation
• The desired effect of nitroglycerin is relief of chest pain by dilating the coronary arteries
• Nitroglycerin mainly dilates systemic veins and arteries, reducing systemic oxygen demands and increasing blood flow to the heart
• Incorrect: Headache is a common side effect due to the dilation of veins and arteries in the brain, but is not the intended therapeutic effect and does not indicate the medication is working
• Incorrect: Nitroglycerin should lower blood pressure, not elevate it
• Incorrect: Diarrhea is not a side effect associated with nitroglycerin