“The intake of Viagra, internationally acclaimed remedy for impotency, may lead to complete loss of vision.” This sensational announcement was made by Dr. Howard Pomeranz who heads a department of neuroophthalmology in medical center of Maryland University. This scientist stated that he had testimonies of at least seven cases of blindness the occurrence of which is due to Viagra administration. Sight loss in such cases occurs because of termination of blood supply to ophthalmic nerve. This condition is observed in men suffering from diabetes or hypertension. Research study by Dr. Pomeranz published in medical magazine confirmed that there were several possibilities that Viagra could be connected with non-arteritic ischemic optic neuropathy. The total number of affected men reached 14 persons.
Representatives of American pharmaceutical company which produces renowned blue pills counter the arguments of the scientist and continue standing for absolute safety of this magic pill. According to their remarks, over several years of Viagra’s presence on pharma market and its consumptions by nearly 20mln Americans, there were no cases of eyesight loss by patients. It means that risk of vision impairment is extremely low. Nevertheless, Dr Pomeranz keeps insisting on his conclusions. According to his statements, Viagra mechanism of action is based on contraction of certain arteries. People with corresponding proclivities may have insufficient blood supply of ophthalmic nerve. It is well known that some people suffering from vision impairments may have temporary eyesight impairments (blurred vision or changing of color perception) after Viagra administration.
Many men were shocked to know that U.S. Food and Drug Administration had confirmed that it investigated acquired records of partial eyesight loss known as non-arteritic ischemic optic neuropathy in some people who had taken this remedy for impotency. Nevertheless, Food and Drug Administration hasn’t made any official conclusions, but reported that records about vision issues were registered among 38 people taking Viagra and among 7 people taking Cialis.
Read also: Goodbye to Erectile Dysfunction, Hello to Eyesight Problems? The Rumored Viagra Side Effect Busted
Is There an Exposure to Disease Due to Viagra or Other Drugs Intake?
No one can tell it for sure. Viagra manufacturer, states that this medication is safe and no evidence proving its impact on vision impairment can be found. Nevertheless, warning about possibility of side-effects, such as erection lasting more than four hours; nevertheless, undesirability of Viagra intake along with other drugs for impotency with nitrate-containing medications remains in full force and effect. All these drugs are designed for cardiac angina therapy and their combination with Viagra may deprive a patient not only of expensive pleasure, but also harm health condition seriously. Viagra should be taken with care by people suffering from peptic ulcer.
Moreover, it is strictly prohibited to take more than one Viagra pill a day. The prescription of this remedy and regimen of its administration is doctor’s prerogative who is fully aware of patient’s problems.
Is There a Chance That Blindness Is Caused by Impotency, but not by Viagra?
Specialists from the U.S. department of health check the records about blindness development in dozens of men taking Viagra and other medications for impotency. Along with that, there is a hypothesis that eyesight loss may be connected with those diseases which lead to erectile dysfunction. American Food and Drug Administration reported that such medicines as Viagra, Cialis and Levitra negotiated of indication in their instruction to use that “in rare cases, partial or complete vision loss is possible”. The company issuing Cialis has already been printing this warning on the labels of its products.
Sudden eyesight loss occurs when blood supply to ophthalmic nerve gets blocked. This condition is named non-arteritic ischemic optic neuropathy (about NAION disease).
Nowadays, there are 43 cases of partial and complete eyesight loss in men who had taken medicines for impotency: 38 – Viagra administration, 4 – Cialis, and 1- Levitra. This is a really in significant percentage, since Viagra was officially licensed in 1998 and taken by more than 24 mln men.
Side-Effects even by the Safest Pills: How Couldn’t You Know That?
Who could have though that generally acclaimed Viagra may be rather harmful than useful? What do you know about Viagra? The remedy contains sildenafil as an active substance which is used for ED therapy. In simple terms, he helps with erectile issues. This medication is also helpful in gastroparesis treatment and such severe disease as arterial hypertension. It is noteworthy, that Viagra may cause mild and severe adverse effects. Researchers from Wales University discovered that sildenafil is able to take adverse impact on human vision. The point is that this drug slows down normal functioning of enzyme which plays definite role in transportation of light signals from human eye to cerebrum.
People who have eyesight impairments have the underlying risk for blindness or pigmented retinitis. Nevertheless, people with good vision may also be negatively affected, since they can be carriers of gen causing pigmented retinitis. It is important that mutation may be met in 2 per cent of human population, i.e. in every 50th man. Pigmented retinitis may develop due to mutation in gen which produces PDE6.
Patients who have two copies of changed gen may be affected by this disorder. It means that a man may not guess that he could have any troubles with eyesight, but in case his genealogy comprises incorrect combination of gens, a patient may have issues with vision after Viagra administration. The research was conducted on mice. Sound and sick (with gens mutation) mice were introduced one-time dose of sildenafil.
After this procedure, healthy mice experienced temporary eyesight loss not to speak of mice with imitations. Animals’ retina was confirmed to have signs of cellular death. Thus, carriers of eye retina diseases were exposed to degeneration. It should be borne in mind that researchers knew about temporary vision disorders in sound people in case of high does administration of Viagra. Thus, similar effects of this medication imply hypersensitivity to bright light, blurred vision and changes of color perception. Therefore, scientists announce that before prescribing Viagra doctors must take into account that consequences for vision may be much more serious than temporary blurred vision. It’s a different matter that men take this medicine without doctor’s prescription. Thus, it is important to think about the consequences of such self-medication.
Viagra and Blindness: Manufacturer’s Opinion
Research associates of Pfizer, producer of famous PDE5 inhibitor, sildenafil (better known as Viagra) have commented on sensational article in medical magazine connecting impaired blood circulation in ophthalmic nerve with the intake of magic pills. The American company representatives refer to technical drawbacks of the research study conducted. It should be mentioned that notorious trial was organized on the principle of selection of people with normal eyesight who are similar to the group of sick people in all significant parameters.
Then these two groups of aged men were interviewed in regards to administration of medications stimulating male strength. Comparison of declared frequency of stimulants intake was decisive in conclusion of connection between medicines and ophthalmic nerve issues. But interviewers and asked ones knew of the fact of vision impairments which could lead to preconception of questions and answers given. All in all, from medical point of view, a critic of retrospective research studies is quite founded. Therefore, it is too early to draw final conclusions.
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