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Ever since it was introduced in 1998, Viagra has been the undisputed, and for a time the only, market leader in the impotence treatment market. Viagra was the first drug to be approved for the treatment of erectile dysfunction. This medication restricts the production of PDE5-the chemical that is responsible for blocking the flow of blood to the penis, thus preventing complete erection. Viagra needs to be taken about an hour before sexual activity and not more than once every 24 hours. The effects of Viagra are visible between 30-120 minutes and last for up to 4 hours. However, the effectiveness of Viagra is impaired by food and alcohol intake.
Levitra was the second erectile dysfunction drug to enter the market in 2003. Consisting of the active ingredient vardenafil, Levitra is an oral prescription medication that needs to be taken about an hour before sexual activity and works for about 6 hours. Like Viagra, it works by boosting the flow of blood to the penis and enables you to retain an erection long enough for complete sexual intercourse. Levitra has been consistently reported to improve the quality of erectile function in men over 40, as well as in those who have other health conditions such as high blood pressure, high cholesterol levels and diabetes.
Cialis followed a few months after Levitra. Consisting of the active ingredient tadalafil, Cialis is a rapidly overtaking its competitors in the popularity stakes because its effects last for up to 36 hours. This gives you greater flexibility and freedom, and you don't have to plan intimacy around doses. Cialis works in much the same way as Viagra and Levitra, but its effects are visible in about 30 minutes, which is considerably faster than the others. Cialis remains active in your body and enables you to achieve and retain erections on a consistent basis.
While Viagra still retains the number one spot in the market and has the highest name recall among users, Levitra and Cialis seem to be catching up rapidly because of the other advantages they offer.
