Viagra FAQ:

Do the New Erectile Dysfunction Drugs Work as Well as Viagra?

Two new drugs, Levitra, from Bayer AG and GlaxoSmithKline PLC, and Cialis, from Eli Lilly & Co. They work the same way as Viagra, blocking the same enzyme. Though it's unlikely any one works better than Viagra overall, slight chemical differences mean that if one brand doesn't work for a patient, another one might.

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