Xalatan eye solution recently lost market exclusivity in major countries, clearing the way for cheaper generic copies.

WSJ: New Drug Approved to Treat Eye Condition

Xalatan, an eye care drug, will also weigh on growth as European patent expired in January 2012.

FORBES: Pfizer Q4 Earnings Preview: Pain From Patent Expirations To Continue

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.

FORBES: Magazine Article