Rizzo 1985.

Methods	Double blinded: yes.
Participants	N=40 Italian men with symptomatic BPH. Age range: 42‐74, mean 62 years. Lost to follow‐up: 0.
Interventions	Control: placebo (n=20). Treatment: P. africanum extract (Tadenan) 100 mg twice daily (n=20). Treatment duration: 60 days.
Outcomes	Nocturia; peak urine flow; residual volume. Adverse events.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	B ‐ Unclear

* Extract of Rad. urticae