clinical researchBefore being approved, Viagra had been clinically studied. It was assessed to see the effect of Sildenafil on the men’s ability to get and maintain erections.
The medicine was given to test participants in the doses of 25, 50 and 100 mg. Their abilities to participate in sexual activity, hardness of erections and duration of the erection were evaluated with special questionnaires and measuring devices.
Sildenafil was administered to more than 3,000 patients aged 19 to 87 years. These patients had impotence of different etiologies including ED from diabetes, atherosclerosis, nerve damage and others).
In all studies, Viagra showed important improvements in erectile dysfunction. The effectiveness and safety of the medicine was established in 21 different studies. clinicalMost men (80%) responded well to Viagra treatment. The rate of satisfaction with sexual intercourse of both partners was confirmed by a great number of Viagra users. The most effective dose was 100 mg of Viagra, according to the studies. But this dose was observed to produce more cases of side effects.
Concerning side events possible with Viagra, only small number of men had side effects. These effects were headaches, stomach upset, and muscle pain, redness of the face or neck.
Patients with kidney or liver disease were also included in the studies. Such patients were observed to benefit from 25 mg of Viagra.
In the end of long-term studies of Viagra, 88% of participants reported successful results in the treatment.