USMLE Step 1 Quiz
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PHARMACOLOGY
Question 1 of 20
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A 75-year-old man with benign prostatic hyperplasia and hypertension is started on a new medication to manage both conditions. On the first day of treatment, he feels dizzy and nearly faints upon standing up from his chair. His blood pressure, which was 150/90 mmHg in the clinic, is now 110/70 mmHg while standing.
This adverse effect is most characteristic of a drug with which of the following mechanisms?
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