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Erectile dysfunction is due to a blood undersupply of the penis. This is caused by the overproduction of the enzyme PDE-5, which prevents the sensitive veins in the genital region from spreading during sexual stimulation, so that more blood can flow in. The main active ingredient in Cialis is called tadalafil, which restricts the production of the enzyme PDE-5. This allows a completely natural erection to occur again in the case of sexual arousal. Cialis also has some minor side effects (clogged nose, headache and facial sweat), but these only have a very minor effect when you consider the positive aspects of Tadalifil. The 36-hour window of action is sensational. Whenever you are sexually stimulated in this time window, you get a strong and hard erection. It is not for nothing that Cialis is also called the weekend pill.