Dunzendorfer 1983.

Methods	Randomized, parallel, double‐blind, placebo‐ controlled study.
Participants	N=30; Geographic region: Germany Mean age: 39 Discontinuations/Not available to follow‐up: none reported
Interventions	Study duration: Phenoxybenzamine (Dibenzyran) 10 mg (n=17) twice daily vs. placebo (n=13). Study duration: 12 weeks
Outcomes	Symptomatic changes (pain evaluation); Erythrocyte and leukocyte counts in the urine following prostate palpation; adverse events.
Notes	Block randomization
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	B ‐ Unclear