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'Viagra' and other aphrodisiac drugs may cause deafness
The U.S. Food and Drug Administration (FDA) recently issued a warning that taking aphrodisiac drugs such as Viagra may cause deafness.
According to Reuters, the drugs mentioned by the FDA include Pfizer's Viagra, Lilly's Cialis and GlaxoSmith-SmithKline's Levitra. Three drugs to treat impotence. In addition, the Pfizer drug Revatio, which has similar main ingredients to Viagra and is used to treat pulmonary arterial hypertension, is also on the warning list.
The FDA issued the above warning based on the results of investigations into dozens of relevant clinical cases, but it has not yet been confirmed that these drugs are the direct cause of deafness. The three pharmaceutical companies are cooperating with the FDA in its investigation and all insist that their products are safe and reliable.
Penny middot Subiah, vice president of Pfizer, said that when Viagra was approved by the FDA in 1998, the drug description stated that side effects included 'possible deafness.' Clinical test results show that the chance of deafness after taking medication is less than 2%.
Information provided by Pfizer shows that nearly 30 million men have used Viagra since 1998, and Viagra's sales in the most recent quarter of 2007 were US$450 million.
The FDA warned in 2005 that aphrodisiacs such as Viagra risked blindness.