Assurans 20mg is a medication that contains the active ingredient Sildenafil Citrate. It is primarily used to treat erectile dysfunction (ED), a condition characterized by the inability to achieve or maintain an erection suitable for sexual activity. Sildenafil Citrate is a phosphodiesterase type 5 (PDE5) inhibitor, which means it works by enhancing blood flow to the penis during sexual stimulation, resulting in improved erectile function.