Forzest 20 mg is available in tablet form and is taken orally. It works by increasing blood flow to the penis during sexual stimulation, allowing for an erection to occur and be maintained. It does not cause an erection on its own and requires sexual arousal to be effective.Tadalafil has a longer duration of action compared to some other ED medications. It can remain effective in the body for up to 36 hours, earning it the nickname "the weekend pill."