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The most important ingredient in Viagra can cause men to see BLUE: to warn doctors about the strongest dose of impotence pill

By taking the strongest dose of sildenafil, the main ingredient in Viagra, you can become color blind for up to three weeks, doctors have warned.

A small number of men taking the highest dose of 100 mg – the strongest available prescription – can suffer from the frightening side effect for up to 21 days.

The warning comes from doctors in Turkey who reported that a series of patients had visual problems after taking medicines that first used sildenafil.

Seventeen men visited the hospital with abnormally dilated pupils, extreme light sensitivity, prolonged blurred vision or tinted color blindness after taking 100 mg of sildenafil. There is no suggestion that they took Viagra – but sildenafil is the active ingredient in the impotence pill. Pfizer admits that sudden loss of vision in one or both eyes is a rare side effect of the drug.

The doctors at the Dunyagoz Adana Hospital admit that all strengths of the remedy for erectile dysfunction are safe for the majority of men.

But they believe that a small subset does not break down properly in the body, leading to high concentrations in the blood even days after it should have been flushed away.

If someone has never used the medicine before, the body is not used to breaking it down. When taken for the first time in such high doses, the body only gets more work to do, the doctors say.

Seventeen men visited the hospital with abnormal vision after taking 100 mg of the active ingredient in Viagra, sildenafil. (stock image of a blue pill)

Viagra – the fastest selling drug in history – can be given on prescription or purchased without prescription in doses of 25 mg, 50 mg and 100 mg.

It works in impotent men by inhibiting an enzyme called phosphodiesterase 5 (PDE5), which dilates blood vessels and improves blood flow through the body, including the penis.

But it also stops the production of another enzyme, known as phosphodiesterase type 6 (PDE6), that converts light into sight.

As a result, some users report blurred vision that disappears within a maximum of three to five hours.

But in the recent study, published in Frontiers in Neurology, doctors pointed to the risk of long-term visual side effects.

Dr. Cüneyt Karaarslan noticed a pattern in 17 male patients who went to the Dünyagöz Adana hospital.

MAN LINKS WITH ‘DONUT-SHAPED’ VISION AFTER TOO MUCH VIAGRA

A man who drank too much sildenafil, the active ingredient in Viagra, got ‘donut-shaped’ spots in his vision.

After drinking a bottle of fluid used to treat erectile dysfunction, the man in his mid-50s began to see the strange shape.

After two months he went to a Massachusetts Eye and Ear, Boston physician who told him that he had problems with his retina – the light-sensitive part of the eye.

It is unknown whether the man, who was not mentioned in the JAMA ophthalmic report in January 2019, has ever recovered because there is no treatment for the condition.

According to the report, the man took about ten times the maximum recommended amount of sildenafil, and drank 30 ml in one go.

The bottle contained 750 milligrams of the medication for erectile dysfunction, compared to the average recommended dose of 50 mg.

TO WHICH OTHER HEALTH PROBLEMS IS VIAGRA LINKED?

Viagra can be given on prescription and purchased without a prescription, and previous research has linked an overdose of the drug to visual disturbances.

Hearing loss

In 2011, Viagra and similar impotence drugs were linked to hundreds of cases of sudden hearing loss around the world.

Research published in The Laryngoscope magazine said it wasn’t clear how long the problems lasted, but this type of hearing loss – usually due to infections and exposure to loud noise – usually causes permanent damage in up to a third of the cases.

Skin cancer

In 2014, American researchers discovered that men who used Viagra were 84 percent more likely to have melanoma, the most deadly form of skin cancer.

The impotence drug is thought to affect the same genetic mechanism that can make skin cancer more invasive.

The patients suffered from numerous visual disorders, including abnormally dilated pupils, blurred vision, light sensitivity, and color vision disorders, including intense blue-colored vision with red / green color blindness.

All 17 patients had used sildenafil for the first time and all took the highest recommended dose of 100 mg.

None of the men had been prescribed the medicine, but had started to buy it over the counter.

The visual side effects started as soon as the drug took effect and were still present when the men arrived at the clinic 24-48 hours later.

The doctors at the clinic performed various eye tests and followed the patients over time to see how their symptoms developed.

Fortunately for all 17 patients the symptoms disappeared 21 days later, but this was undoubtedly a difficult experience for the men involved.

Starting with a lower dose may have meant fewer serious side effects.

Moreover, taking the medication with medical supervision would probably have meant that the men would not have used such a high dose the first time.

Dr. Karaarslan said: ‘Many men use non-prescription performance enhancing drugs to help with sexual anxiety and erectile dysfunction.

‘For the vast majority of men, side effects are temporary and mild. However, I wanted to emphasize that persistent eye and vision problems can occur for a small number of users.

“Although these drugs, when used under the supervision of doctors and at the recommended doses, provide very important sexual and mental support, uncontrolled and inappropriate doses should not be used or repeated.”

Pfizer, the manufacturer of Viagra, said it is not clear whether patients have taken their product. But the Turkish doctors said they all took sildenafil, which active ingredient in the famous blue pill.

A spokesperson for Viarga said: ‘This is a retrospective study in which the subjects took 100 mg sildenafil (the highest dose) without a prescription (Viagra is only available via a prescription at 100 mg).

“That’s why there is no way to know where or how the individuals won the sildenafil.

“Based on this, it is not known whether they have used Viagra, sildenafil or branded medicines or whether the medicine was obtained from legitimate sources.”

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