A 52-year-old man with hypertension and lower urinary tract symptoms (LUTS) due to BPH is started on doxazosin. After 3 days, he reports severe dizziness on standing, near-syncope while getting out of bed in the morning, and a blood pressure drop from 150/95 mmHg to 110/60 mmHg (supine to standing). He denies chest pain, palpitations, or arrhythmias. What is the most appropriate next step in management?

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