When taking a look at Viagra one must consider how it works. Viagra is used for erectile dysfunction, sometimes known as impotence. Viagra helps men to get and keep an erection while sexually excited by filling the penis with enough blood to expand or harden, once intercourse is finished the penis returns to normal. Some side effects such as headaches, flushing of the face, upset stomach, less common side effects include blurred or loss of vision.

Cialis is different than Viagra, because Cialis can last up to thirty-six hours, which allows you and your partner more, time to be intimate. Cialis works similar to Viagra because it increases the blood flow to the penis allowing you to achieve an erection, which improves erectile dysfunction.

Although, Cialis may have side effects, such as upset stomach, back pain, headache, muscle aches. Less severe symptoms can be an erection, which lasts more than four to six hours. If this happens calling your doctor will be a better option, as this kind of erection can damage the penis.

Levitra works like Cialis and Viagra by increasing blood flow to the penis when a man is sexually excited, and then decreasing the blood flow when intercourse is finished. The side effects of levitra are upset stomach, blurred vision, and an erection that doesn’t go away.

It is clear that Viagra, Cialis, and levitra have much uncommon as far as their use, also one other common factor is that all three can not be taken when on nitrates such as the heart medication nitroglycerin, this is most significant because the combination can cause blood pressure below normal, and heart attack.
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Cialis vs Levitra Viagra