How effective is Viagra ®?
Over 21 studies have been done to evaluate the efficacy of Viagra®. Evaluation of drug activity was most often done using a self-assessment questionnaire. During a 6-month open labeled study, Viagra® was found to improve sexual function in 88% of those treated. This included frequency, firmness, and maintenance of an erection; frequency of orgasm; frequency and level of desire; frequency, satisfaction and enjoyment of sexual intercourse; and overall relationship satisfaction.
