What do systematic reviews say?

Anticholinergic medication vs placebo

Anticholinergics may leads to higher adverse events:urinary retention compared with placebo (low certainty).

• Oral anticholinergic drugs versus placebo or no treatment for managing overactive bladder syndrome in adults 2023 · Cochrane Headline outcomes only
  RR 3.52 [2.04, 6.08]
  17 studies · 7862 participants
  Low