(R)-Oxybutynin-d 10 (Aroxybutynin-d 10 ) is deuterium labeled (R)-Oxybutynin. (R)-Oxybutynin (Aroxybutynin) is the racemic isomer of Oxybutynin and an orally active muscarinic receptor antagonist. (R)-Oxybutynin has antispasmodic, antimuscarinic, and anticholinergic activities and competitively antagonizes carbachol-induced contractions. (R)-Oxybutynin can be used to study urinary incontinence caused by neurogenic bladder dysfunction.