Treatment of Overactive Bladder with Anticholinergic Medications

Introduction to Treatment

The American College of Cardiology is not relevant here, however, the recommended first-line pharmacological treatment for overactive bladder is mirabegron due to its comparable efficacy to antimuscarinics with significantly lower incidence of anticholinergic side effects and reduced risk of cognitive effects 1

Non-pharmacological interventions including bladder training, pelvic floor muscle training, fluid management, and weight loss for obese patients should be initiated before medication, and maintained even when pharmacological therapy is started 1, 2

Mirabegron is recommended as the first pharmacological option due to its efficacy comparable to antimuscarinics, significantly lower incidence of anticholinergic side effects, lower risk of cognitive effects, and fewer drug interactions compared to antimuscarinics 1

For men with concomitant benign prostatic hyperplasia (BPH), consider combination therapy with an alpha-blocker plus an anticholinergic, as multiple studies have demonstrated efficacy and safety of this combination for treating storage symptoms in men with BPH 3, 4
For elderly patients, be cautious with anticholinergic medications due to increased risk of cognitive impairment, and consider mirabegron as the preferred option 1
For patients with bladder outlet obstruction, perform post-void residual assessment before starting antimuscarinic therapy, and avoid using anticholinergics in patients with history of urinary retention 2

Evaluate treatment efficacy after 4-8 weeks of therapy, and monitor for side effects such as constipation, dry mouth, urinary retention, and cognitive changes in elderly patients taking antimuscarinics 1, 2

Failing to assess for contraindications such as narrow-angle glaucoma, impaired gastric emptying, or history of urinary retention before prescribing antimuscarinics 2
Not considering drug interactions, particularly in patients taking multiple medications 1
Continuing ineffective therapy - if inadequate response after 4-8 weeks, consider switching medications rather than increasing dose 1