[Nocturnal penile tumescence and the effect of tadalafil on erectile dysfunction].

Objective: To explore the correlation between the results of the nocturnal penile tumescence (NPT) test and the efficacy of tadalafil in the treatment of ED.

Methods: A total of 188 ED patients were divided into a normal NPT group (n = 136) and an abnormal NPT group (n = 52) according to the results of the NPT test. All of them were treated with tadalafil at 20 mg 3 times a week.