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"Viagra" impotence drugs may cause deafness
Released by the us food and drug administration (FDA) warned that "viagra" impotence drugs can cause deafness.
According to Reuters, the FDA mentioned drugs including Pfizer Viagra (Viagra), lilly Cialis "(Cialis) and glaxo -" our strong "GSK's pharmaceutical company (Levitra) three kinds of drugs for the treatment of impotence.In addition, similar to the "viagra" main composition, Pfizer medicines used in treatment of pulmonary hypertension Revatio warning list.
The FDA is based on dozens of related results of clinical cases issued the warning, but not yet confirmed these drugs is the direct cause of deafness.The three pharmaceutical company is cooperating with the FDA's investigation, they all insist that their product is safe and reliable.
Pfizer's vice President Stewart;Than o said, "viagra" FDA approval in 1998, the drug instructions and indicate the side effects including "may cause deafness".Clinical test results show that less than 2% after the chance of deafness.
Pfizer provides data show that in 1998 it has been nearly 30 million men used viagra, viagra in 2007 sales of 4 in the most recent quarter.Us $500 million.
In 2005, the FDA warned that "viagra" aphrodisiac have a risk of blindness.