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Bayer and GlaxoSmithKline are the manufacturers allowed to produce this drug that got its approval from FDA (Food and Drug Administration) on 19th august 2003. Due to its increasingly productive results it has captured the market within a very short span of time. The development of Levitra was initiated to challenge the monopoly of Viagra. For many years there was just only one drug that can solve sexual dysfunction, it was Viagra. A huge amount of money was made with this drug. Imagine, before Viagra, there were no drugs that could face sexual dysfunction, it is said that some foods or some plants were able to do the work, but nothing sure. The corporation who developed Levitra was Bayer Pharmaceuticals. If Vardenafil HCl (Levitra) wanted to be a significant competition it would have to add some advantages that Viagra didn’t have.Next
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Viagra (sildenafil) is a prescription medication used for treating problems with obtaining or maintaining an erection (erectile dysfunction) also known as impotence. Erectile dysfunction is inability to get or keep an erection firm enough for sexual intercourse. Viagra is manufactured by Pfizer, an FDA approved drug in 1998. Viagra acts by relaxing the muscles and increasing the blood flow to the penis. Sildenafil. The active ingredient of Viagra belongs to PDE -5 enzymes inhibitor group. Viagra delays these enzymes from working too quickly. Erection is produced by release of chemical messengers cGMP.cGMP causes the blood vessels in the penis to widen by relaxing a thin layer of muscle found in the blood vessel walls.
If you have difficulty having or keeping an erection more than 25% of the time, it is considered a problem. Viagra is considered as the most effective and commonly used sexual drug for maintaining an erection. It’s given 30 to 60 minutes prior to sexual activity and permits the vascular caverns of the penis to relax. The vessels widen and dilate with blood leading to an erection. This hardening compresses the veins at the base of the penis and thereby prevents flow of blood away from the penis which causes erection. Viagra is used to treat impotence in men. Viagra increases the body’s ability to achieve and maintain an erection during sexual stimulation. Viagra does not protect you from getting sexually transmitted diseases, including HIV. Add Viagra to the list of party drugs connected to unsafe sex.