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Cialis levitra vs more durable the erection. Cialis inhibits the PDE5 cialis levitra vs preserving cGMP levels, therefore aiding erection viability and durability.*******************The BIG Discovery: cyclic guanosine monophosphate (cGMP)Some very smart scientists discovered that cyclic guanosine monophosphate (cGMP) was the key to sustaining an erection.They discovered that when a man gets sexually stimulated, cialis levitra vs chain reaction occurs in the tissue of the penis that results in cialis levitra vs levels of cialis levitra vs a substance called cyclic guanosine monophosphate (cGMP).As long as there are sufficient cialis levitra vs of cGMP, the penis cialis levitra vs remain erect. The more cGMP, the more robust and durable the erection.If you inhibit the degradation of cGMP it stays around in the penis longer, producing a more durable erection.Another way you can think of Cialis (and all other similar medicines) is that it preserves the elevated levels of cGMP that are created when a man is sexually stimulated for a stronger, more lasting erection.That's how Cialis works - Cialis blocks the.

Cialis levitra vs not billions of dollars. Soon Icos received its very first patent in 1994 on IC351, and the clinical trials of phase trials.