One must consider how Viagra works and is used for erectile dysfunction also known as impotence. Viagra helps men to have and keep an erection when he is 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 drug is different than Viagra as it lasts up to thirty-six hours, which allows you and your partner with more time to be intimate. Cialis is similar to Viagra increases the blood flow to the penis and allowing you to achieve an erection, which helps in erectile dysfunction. Cialis has side effects such as an upset stomach, back pain, headache, muscle aches. Less severe symptoms can be an erection, which lasts more than four to six hours. It would be wise to call your doctor as this kind of erection can damage the penis.
Levitra works similarly as 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 are an upset stomach, blurred vision, and an erection that doesn't go away.
It is clear that Viagra, Cialis, and levitra have common features as far as their use is concerned, also one other common factor is that all three can not be taken when on nitrates such as the heart medication nitroglycerin this is important as this combination can cause blood pressure below normal, and may cause a heart attack.
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