Final answer:
After administering nitroglycerin, it's necessary to reassess the patient promptly because the medication can cause decreased blood pressure as a side effect, necessitating close monitoring.
Step-by-step explanation:
You must reassess your patient within two minutes after administering nitroglycerin, as one of the side effects is decreased blood pressure. Nitroglycerin is used for the treatment of angina and other heart-related conditions, and it works by dilating the blood vessels to improve blood flow. However, due to its vasodilating effects, it can also lead to a significant drop in blood pressure. Monitoring is crucial to ensure that the patient does not experience severe hypotension, which can be dangerous. Immediate reassessment allows for the detection of any adverse effects and the implementation of necessary interventions.