Cialis has an average rating of 8.5 out of 10 from a total of 548 ratings on Drugs.com. 83% of reviewers reported a positive effect, while 9% reported a negative effect. Viagra has an average rating of 8.5 out of 10 from a total of 255 ratings on Drugs.com. 83% of reviewers reported a positive effect, while 9% reported a negative effect. More @Wikipedia
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