Wedren 1987.

Methods	Randomized, parallel, double‐blind, controlled study.
Participants	N=30; Geographic region: Sweden Mean age: 37.7 Discontinuations/Not available to follow‐up: 6 (5 pentosan, 1 placebo)
Interventions	Sodium pentosanpoly sulphate (Elmiron) 100 mg (n=15) x 2 twice daily vs. placebo (n=15). Study duration: 3 months
Outcomes	Symptomatic changes, physician rating of treatment and symptom score; uroflowmetry; adverse events.
Notes	"Randomized blindly"
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	B ‐ Unclear

† Contains men with prostatodynia