Cialis (Tadalafil) works by enhancing the effects of one of the chemicals the body normally releases into the penis during sexual arousal. This allows an increase of blood flow into the penis. An erection is the result of an increase in blood flow into certain internal areas of the penis.
The recommendation is to take Cialis 30 minutes prior to sexual activity. Generally, the effects of Cialis last 24 to 36 hours after taking it.
