Tadalafil blocks the action of PDE5, so that cGMP is not broken down, and can exert its effect to allow blood to enter the penis and cause an erection. It has the same active ingredient as Cialis , but it is the generic non-branded version. Tadalafil is generally safe to take with most medication. The chances of experiencing side effects are lower with the 10mg strength, in comparison with 20mg. What Is Cialis?AdVom ärztlichen Rezept bis zur Medikamenten-Bestellung und Lieferung innert 24 Stunden. Bei uns kriegen Sie Ihr Rezept vor dem Kauf online. Ganz unkompliziert. We have good news for you: generic Cialis, used to treat erectile dysfunction (ED)and enlarged prostates, just hit pharmacies. Prices for the generic, known as .  · Descriptions. Tadalafil is used to treat men who have erectile dysfunction (also called sexual impotence). Tadalafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where .