The Pfizer logo is displayed on the exterior of a former Pfizer factory, on May 4, 2014, in the Brooklyn borough of New York.Mark Lennihan/AP Pfizer is facing a shortage of penicillin due to increased demand and more diagnoses of syphilis, the company said in a letter to its customers this week.The company said there is an "impending stock out situation" for select Bicillin L-A and Bicillin C-R prefilled syringes, Pfizer's brand name of injectable penicillin.
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