Sildenafil is a PDE5 inhibitor that helps to treat erectile dysfunction in men (above 40 years). This medication also helps to improve pulmonary arterial hypertension and benign prostatic hyperplasia. Sildenafil starts working within 30 minutes and the effectiveness lasts for 4 hours. Sildenafil stays in the system for up to 20 hours. However, various factors can alter the duration it lasts in the system.

To know in details about how long Sildenafil stays in the system read this blog at Remedy Counter:

https://remedycounter.com/blog/how-long-does-sildenafil-stay-in-your-system/