Adding an antimuscarinic or beta-3 agonist to an alpha-blocker for storage symptoms is common and usually safe. The risk is acute retention in a man who is already emptying poorly.
A bladder scan for post-void residual takes a minute and identifies those at higher risk. A large residual suggests obstruction or a poorly contracting bladder needs assessment first.
- Measure post-void residual by bladder scan before adding a bladder relaxant in men.
- Assess further before adding one when the residual is large or the stream very poor.
- Warn patients to seek help urgently if they cannot pass urine.
- Recheck symptoms and residual at follow-up after starting treatment.
Why it matters
A simple scan prevents a predictable episode of retention.
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