Viagra (sildenafil), Cialis (tadalafil), Levitra (vardenafil), and Stendra (avanafil) are all part of a family of drugs called PDE-5 inhibitors. PDE-5 (phosphodiesterase type-5) is an enzyme that breaks down a molecule called cGMP, resulting in vasoconstr
How quickly does Cialis work? First, Cialis works relatively quickly but not as fast as Viagra. It can take 1 – 2 hours for the full effects of Cialis to kick in, though it only takes about an hour for Viagra to work fully. How long does Cialis last? On
Viagra, Cialis, Levitra, and Stendra are all in a class of drugs called PDE5 inhibitors.These drugs work by blocking an enzyme called phosphodiesterase type 5.
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