Which of the following is a common anticholinergic drug used to treat overactive bladder?

Oxybutynin is a commonly used anticholinergic agent specifically indicated for the treatment of overactive bladder. This drug works by inhibiting the actions of acetylcholine on muscarinic receptors in the bladder, thereby reducing involuntary contractions and increasing bladder capacity. It effectively alleviates symptoms such as urgency, frequency, and nocturia associated with overactive bladder.

Atropine, while an anticholinergic, is primarily used in clinical settings for its effects on the heart and as a pre-anesthetic agent rather than for urinary conditions. Benztropine is primarily employed in the management of Parkinson's disease and for medication-induced extrapyramidal symptoms, not for bladder control. Scopolamine is used mainly for motion sickness and postoperative nausea, again diverging from the treatment of bladder issues. Therefore, Oxybutynin stands out as the targeted treatment for overactive bladder symptoms among the options provided.