July 26, 2005

Canada issues warning about Viagra vision loss

OTTAWA (Reuters) - Canada advised users of the erectile
dysfunction drugs Viagra, Cialis and Levitra on Tuesday to
"seek immediate medical attention" if they experience sudden
vision loss or other vision-related problems when taking the

Canada's health ministry said it was likely to change the
product information for the three drugs. Earlier this month the
U.S. Food and Drug Administration approved new labeling to warn
men about possible blindness from Pfizer Inc.'s Viagra.

The U.S. warning labels also affect Cialis -- sold by Eli
Lily & Co. and Icos Corp. -- and Levitra, which is co-promoted
by GlaxoSmithKline and Bayer AG .