The only of the reports about Viagra research in mass media which realistically evaluates one of the most important questions of this preparation effect is “To what extent can Viagra improve the duration of erection?” This report was published in 1996 in the British Urology Magazine. Scientists examined 12 men with erectile dysfunction taking Viagra or placebo in various dosages. During this examination the patients were subjected to “visual erotic stimulation”. The patients were from 36 to 63 of age. The patients taking placebo pills noted that the duration of their erection increased at the average had increased by one minute. Those taking Viagra pill of 25 mg noted that their erection was 8 minutes longer, and of 50 mg – about 11 minutes.
Viagra doesn’t restore erection to the “normal” level. According to the two most important factors characterizing the hardness of the penis at the period of erection and the ability to keep this state the indices of the patients taking Viagra are a bit lower than among those who’ve never suffered from erectile dysfunction. Though Viagra increases the possibility of successful coitus among men with erectile dysfunction, it doesn’t guarantee a hundred-pre-cent success. The patients taking Viagra have about 82 % of sex acts from 100.
Viagra can help nearly 70 % of men suffering from erectile dysfunction. One of the most amazing characteristics of Viagra is that the reason of sexual disorder makes no matter – whether it’s some somatic cause like diabetes, or neurological like spinal injury, or mental disease manifested in depression.
Viagra has best revealed its qualities in those cases when erectile dysfunction was provoked by some psychological problems. Among men with psychogenic erectile dysfunction taking Viagra 70 % of all sex acts were successful, while the same index for the patients taking placebo was 29 %.
The degree of Viagra effectiveness in cases of erectile dysfunction caused by different diseases:
| Diagnosis | Viagra | Placebo |
| Spinal injury | 83% | 12% |
| Hypertension | 68% | 18% |
| Diabetes | 59% | 16% |
| Radical prostatectomy | 43% | 15% |
Viagra is effective in the case of impotence caused by physiological reasons. Among 68 % of men with erectile dysfunction caused by physiological reasons a considerable improvement was noted at Viagra taking (among men taking placebo the improvement was noted only in 19 % of cases).
The above table offers the results of Viagra effectiveness in the treatment of erectile dysfunction caused by different diseases.
As the research works have shown, Viagra’ action is not so effective upon the patients who had undergone radical prostatectomy in connection with prostate gland cancer than in other cases. This can be easily explained: the medicine can improve blood circulation in the nerves of the sexual sphere, but in those cases when these nerves are absent or interrupted, the effect of Viagra is noticeably lower.
It turned out that Bob Dole, the ex-senator and the presidential candidate of the USA was one of the 110 patients subjected to radical prostatectomy and taking part in the clinical testing of Viagra. Bob Dole mentioned that Viagra is a wonderful medicine. Elizabeth Dole, the president of American of the Red Cross, answering questions at a special news conference in New York repeated the words of her husband: “A wonderful medicine!”
The positive influence of Viagra on the organism isn’t limited to the achievement of more evident and prolonged erection. The survey of the patients having taken Viagra, done before and after the medicine approbation, has shown that Viagra influences some other sides of sexual life. Those who had been taking Viagra noted unusual erection durability, more frequent orgasm, higher level of sexual arousal, and greater pleasure from coitus in general.
It’s interesting that those men who had been taking Viagra and those taking placebo had sexual act with the same frequency – at the average twice a week. Though among the patients taking Viagra the coitus was more successful – they noted the positive result in 66% of cases while in case of taking placebo – the index was about 20%.
It was found out that Viagra has the best effect on those men who had been taking it for the longest period of time. For example, among the patients who had taken part in the longest testing – it lasted for a year – Viagra promoted erection improvement in 88% of cases.
Diabetes. One of the research works of Viagra effect was held among 268 patients with diabetes complications. Those people got Viagra in the dosage of 50 mg, then the dosage grew up to 100 mg, at the end of the course the dosage was lowered to 25 mg. The researchers note erectile function improvement according to the two main criteria (the frequency of successful sex acts and the ability to keep up erection) among the patients taking Viagra in comparison with those taking placebo.
The improvement of sexual function was noted by 57% of the diabetes patients taking Viagra and only 10% of the patients taking placebo. 48% of all sex act were successfully finished (among the patients taking Viagra) while among those taking placebo this index is about 12 %.
Spinal injury. One more research work was held among 178 patients with erectile dysfunction caused by spinal injuries. As well as in the previous case, the results got in case of Viagra taking are quote different from those in case of placebo taking. The frequency and successfulness of coitus in case of the preparation regular taking is definitely higher. Viagra has greatly influenced the quality of erection among 83% of the patients in comparison with 12% of placebo group. According to the records of the participants of the experiment 59% of sexual contacts were successfully finished while among the patients of placebo group only 30 % of sex acts were successful.



