SerranoBrambila 2000.

Methods	RCT. Placebo controlled, crossover design. Double‐blind. Masking of assessors not stated.
Participants	44 female patients. Inclusion criteria: Unstable bladder.
Interventions	Treatment 1: oxybutynin 5mg tid (n=22) Treatment 2: placebo (n=22) 2 x 6 week treatments with one week washout between treatment periods.
Outcomes	Symptom questionnaire (VAS). Leakage episodes, frequency of micturition. Residuals. Urodynamic parameters. Adverse events. Laboratory tests.
Notes	Translated from Spanish. 7 dropouts (treatment 1: 5, treatment 2: 2) No follow up. Data not in useable form for this review.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear