Sildenafil is a phosphodiesterase-5 (PDE-5) inhibitor. A brand of medicine known as Cenforce Soft 100mg is used to treat erectile dysfunction (ED), a disorder marked by the inability to obtain or sustain an erection strong enough for sexual activity. Sildenafil citrate, the primary component of Cenforce, is a member of the group of medications known as phosphodiesterase type 5 (PDE5) inhibitors. When a man with ED is sexually excited, sildenafil helps him attain and maintain an erection by boosting blood flow to the penis.