The man checked into a New York clinic complaining that he has only been able to see things in red for a year after taking a drug for erectile dysfunction bought on the Internet.
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The patient said that the symptoms appeared soon after he took sildenafil citrate – the main ingredient in popular erectile dysfunction drugs. The man said he bought the drug online and drank the liquid “directly from the bottle,” according to a medical report published in Retinal Cases.
“To actually see these types of structural changes was unexpected, but it explained the symptoms that the patient suffered from,” said Dr. Richard Rosen, the report’s lead author and director of Retina Services at Mount Sinai Hospital.
“While we know colored-vision disturbance is a well-described side effect of this medication, we have never been able to visualize the structural effect of the drug on the retina until now,” Rosen added.
Pfizer, the pharmaceutical company that sells Viagra, a pill for the treatment of erectile dysfunction, denied their product could produce such an effect.
“Pfizer is aware of media reports incorrectly citing Viagra as the medicine linked to a case report issued by Mount Sinai Hospital,” a Pfizer spokesperson told Vice in a statement. “According to the hospital statement, the individual actually purchased liquid sildenafil online, with no indication whether a prescription was provided, and then ingested an unspecified dosage,” they added.
Dr. Rosen believes that the amount of drug taken is to blame — “much more than 50 mg/ml that the measuring pipette would have delivered” according to the medical review – and the fact that the drug wasn’t prescribed but was ordered on the Internet. “People live by the philosophy that if a little bit is good, a lot is better,” Dr. Rosen stated. “This study shows how dangerous a large dose of a commonly used medication can be.”