A new US study attempts to suggest that men who take Pfizer's Viagra (sildenafil) or similar drugs for erectile dysfunction may double their chances of hearing impairment, adding to a Food and Drug Administration warning from 2007 about this side effect.
High doses of Viagra have been shown to damage hearing in mice, but until now only a few anecdotal cases had been described in humans.
The study, based on a national sample of American men over 40, found that slightly more than one in six of those who did not take Viagra-like drugs -- for instance, Eli Lilly's Cialis -- were deaf or hard of hearing.
Source here.
