Intravaginal Delivery of Oxybutynin: An Alternative Administration Route to Improve its Pharmacokinetic and Pharmacodynamic Effects

While oxybutynin is the most efficacious oral antimuscarinic treatment to reduce incontinence episodes in patients with an overactive bladder, oxybutynin is often discontinued due to significant side effects. This is hypothesized to be caused by its metabolite. The purpose of the study was to determine whether intravaginal oxybutynin administration leads to fewer anticholinergic side effects than oral oxybutynin. Additionally, the pharmacokinetics (PK), safety, and tolerability were compared.