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A man who drank a lot of Viagra's active ingredient, sildenafil, for an eye injury made him see a strange shape resembling "rings of donuts".
After drinking a bottle of liquid used to treat erectile dysfunction, the man (in his mid-fifties) began to see the strange shape. Two months later, he went to an ophthalmologist in Massachusetts and told him that he had retinal problems (light-sensitive part).
It is unclear whether the man, who was not named in the JAMA report for Ophthalmology, recovered, due to the lack of treatment for this condition.
Previous studies have associated an overdose of Viagra with visual disturbances.
According to the report, the man ate about ten times the recommended maximum of sildenafil, drinking 30 ml at a time. The bottle contained 750 ml of erectile dysfunction compared to the recommended dose of 50 mg.
Suffering from a sensitivity to light and an inability to see in low light, the tests have confirmed the damage to the eyes of man.
In the case report, Dr. Hilary Brader, who treated the patient, stated that the patient was no longer following up.
Viagra works by increasing blood flow to the penis by inhibiting the enzyme (PDE5). Another enzyme associated with "PDE6", present at high concentrations in the retinal cells, is also inhibited and would be responsible for the accumulation of a toxic molecule in the cells.
This is not the first time that sildenafil is associated with vision problems.
Australian researchers have stated that Viagra could permanently affect the vision of men with an inherited eye disease, retinitis pigmentosa. The most common side effects of Viagra are headache, nausea, hot flashes and dizziness.
Dr. Prader decided to spread the disease to educate ophthalmologists.
The manufacturer's website suggests that abnormal vision, such as changes in color vision and blurred vision, are common side effects.
In rare cases, the sudden loss of sight in one or both eyes may be a sign of a serious eye problem called anterior non arterial neuropathy.
Source: Daily Mail
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