## Alpha-Blocker Adverse Effects and Safety Profile **Key Point:** Alpha-blockers do NOT cause hypertensive crisis on abrupt withdrawal. Unlike beta-blockers or clonidine, sudden discontinuation of alpha-blockers does not trigger rebound hypertension or coronary vasospasm. This is a common misconception. ### Correct Answer Explanation The statement about hypertensive crisis and coronary vasospasm upon abrupt discontinuation is **FALSE**. Alpha-blockers can be stopped abruptly without rebound hypertension. This is a critical distinction from beta-blockers and central alpha-2 agonists (clonidine, methyldopa), which DO require gradual tapering. ### Recognized Adverse Effects of Alpha-Blockers | Adverse Effect | Mechanism | Clinical Relevance | |---|---|---| | **IFIS** | α1A-blockade in iris dilator muscle | Silodosin, alfuzosin; complicates cataract surgery; inform ophthalmologist | | **Orthostatic hypotension** | Vasodilation; loss of vascular tone | Prazosin > doxazosin; mitigated by slow titration, bedtime dosing | | **First-dose syncope** | Acute vasodilation with rapid peak levels | Prazosin most notorious; give first dose at bedtime | | **Retrograde ejaculation** | Loss of bladder neck contraction | 10–15% incidence; reversible; major concern in younger men | | **Nasal congestion** | α1-blockade in nasal vasculature | Doxazosin > prazosin | **High-Yield:** IFIS is a major consideration when counseling men on alpha-blockers who may need cataract surgery. Ophthalmologists should be informed preoperatively. **Clinical Pearl:** Unlike beta-blockers (which cause rebound tachycardia and hypertension) and clonidine (which causes rebound hypertension and tachycardia), alpha-blockers are safe to discontinue abruptly. No tapering is required. **Warning:** Do not confuse alpha-blocker withdrawal with beta-blocker or clonidine withdrawal. This is a high-yield exam trap.
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