['To determine the influence of aging on the efficacy and safety of doxacurium.', 'Open, randomized, phase III study.', 'Inpatient ophthalmic surgery clinic at a university medical center.', '30 elderly patients (65 years or older) compared with a control group of 30 younger patients (18 to 64 years).', "An elective ophthalmological surgical intervention of more than 2 hours' expected duration with general anesthesia with isoflurane.", 'Neuromuscular function after a bolus dose of doxacurium was monitored electromyographically. No significant difference was observed in maximum block achieved or onset time. Clinical duration of neuromuscular block was similar in both groups. Hemodynamic changes were clinically unimportant.'] Is doxacurium block influenced by age?