Superman 100mg

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Cialis vs. Viagra quick comparison
One difference between the medications is how long they stay in your system. Cialis provides penile hardness (the ability to maintain an erection) for a longer period of time than Viagra because it lasts up to 18 hours, while Viagra only lasts about 4 to 6.

During sexual stimulation, the nervous system in penile tissue releases nitric oxide (NO). The NO stimulates a messenger enzyme called cyclic guanosine monophosphate (cGMP). The cGMP relaxes the smooth muscle cells in the arteries of the penis causing them to dilate and blood to flow into the penis more easily. If you are not mentally sexually aroused, your brain will not stimulate the release of any nitric oxide and you will not produce increased levels of cGMP.

Occasionally Tadalafil might not work the first time you take it for various reasons. Most doctors advise taking Cialis at least eight times before resorting to another PDE-5 inhibitor such as Viagra.