Increased competition from generic versions of PDE5 inhibitors will significantly affect the marketplace for these drugs over the next several years. Another difference among the three drugs is that while Viagra's action may be delayed or impaired when taken with food (especially high-fat foods), that's not the case with Levitra or Cialis. It's worth noting that effectiveness of placebo was 57 por cien for mild ED, 27 por cien for moderate ED, and nueve por ciento for severe ED.Viagra has proved beneficial for many men with ED resulting from spinal cord agravies.

According to the most recent data available from the makers of the three ED medications, Viagra continues to outsell its competitors, but the margin is growing smaller, with Cialis nipping at its heels. While Viagra experienced a dos por cien dip in sales in dos mil nueve and a dos por cien rebound in 2010, Cialis sales grew by 8 por ciento in dos mil nueve and 9 por cien in dos mil diez. The sales figures are staggering, with both Viagra and Cialis selling in the billions of dollars worldwide in 2010 (see Figure ocho): Viagra sold $ 1.934 billion worth, and Cialis hit the dólares americanos 1.699 billion mark.

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