Xalatan eye solution recently lost market exclusivity in major countries, clearing the way for cheaper generic copies.
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Xalatan, an eye care drug, will also weigh on growth as European patent expired in January 2012.
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Earlier this year Pfizer executives were alerted to a batch of fake Lipitor when five patients saw their cholesterol skyrocket and to a counterfeit of the glaucoma drug Xalatan that contained mainly the antiseptic boric acid.