Keyword Analysis & Research: sildenafil

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What is the difference between sildenafil and Viagra?

Cialis (tadalafil) is known as the "weekend pill," because it lasts approximately 17 to 36 hours. Levitra (vardenafil) is similar to Viagra (sildenafil), in that it lasts about five hours; Viagra (sildenafil) lasts about four hours.

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