The active substance in this drug is Tadalafil – this is a very effective tool for increasing sexual arousal. Tadalafil is a generic Cialis, it acts on the male body in a similar way, that is, it increases the flow of blood to the penis (in this case, the presence of a natural sexual arousal of a man is also mandatory). The main difference between Cialis and Viagra is a longer duration, which can be up to 36 hours. In addition, the effect of Tadalafil is somewhat more pronounced than that of his “colleague” Sildenafil.