One of the varieties of the side effect of Viagra - a violation of vision - for some reason immediately attracts attention to itself.

The disorder of vision that most often occurs when taking Viagra is described as follows: a person sees everything in blue and a little fuzzy, as if looking through a bright blue grid. Some patients note blurred images and increased sensitivity to bright light. Others report difficulties in distinguishing between green and blue colors.

As a result of clinical studies, it has been established that visual impairment in the use of Viagra is quite moderate, lasting only a few hours and occurs in about three percent of consumers. Disorders of vision are more often manifested when using high doses of the drug.

Thus, among men who took VIAGRU in a dosage of 100 mg, visual impairment was detected in 11% of the examined, compared with 3% among those who received the drug in smaller doses. Why does Viagra break vision? The fact is that the main mechanism of action of this drug is the blockade of the enzyme 5-phosphodiesterase. Almost all of this enzyme is contained mainly in the genitals - that is why the "target organ" in Viagra is so specific - the penis. But in the human body there are other enzymes, similar in structure to 5-PDE, albeit in much smaller quantities. VIAGRA also acts on these enzymes - and one of them, 6-phosphodiesterase, is contained in the human eye. Visual disorders with the use of Viagra were detected already in the first weeks of the receipt of this medicine in the pharmacy network and attracted close attention of the press. In the news bulletins, reports began to appear that VIAGRA is much more likely than not to cause visual disturbances, possibly because some men abuse the medicine, taking larger doses than prescribed by the doctors.

But you can not completely exclude the possibility that taking Viagra can affect the body of vision, plus - it is possible that in the course of time some other negative side of this drug will appear. Specialists from the Academy of Ophthalmology advise men who take Viagra to pay special attention to visual disorders, especially if these patients suffer from some eye diseases - for example, macular degeneration or pigmented retinitis. By the way, on the annotation to VIAGRE there is a note that patients suffering from pigmented retinitis should treat the medication with extreme caution. The staff of the Medical Faculty of Stanford University became interested in the problem of visual impairment in the case of an overdose of Viagra and investigated the effect on the vision of a dose of Viagra in 200 mg, that is twice the maximum daily dose. Dr.

Michael Marmor, who led the research, reports that such an overdose of Viagra significantly reduces the sensitivity of the fiber by 30-50% for a period of about 5 hours. In response to the warning of the Academy of Ophthalmology, Pfizer carried out additional studies and proved that "visual disturbances that are possible with the use of Viagra in normal dosage are expressed, as a rule, moderately and quickly". The company Pfizer also stated that it is going to with the help of volunteers to conduct an "in-depth study of the impact on the eyesight" of increased doses of Viagra medicus. En.

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