Urethral obstruction to be ruled out prior to bladder relaxant use to aviod urinary retention
If above not helpful
Oxybutynin 2.5 to 5 mg three to four times/day
Terodiline 1 to 2 mg twice daily
imipramine 25-100 mg at bedtime
doxepin 25-100 mg at bedtime
Prefer low doses. All four medications
can cause urinary retention due to anticholinergic side effects
imipramine helps concurrent depression