Pharmaceutical giant GlaxoSmithKline has recalled a four-in-one flu vaccine because its potency diminishes over time.
The London-based company issued its voluntary recall of FluLaval Quadrivalent Theimerosal-Free vaccine, which comes in pre-filled syringes, on Tuesday.
“The lots are being recalled due to the potential for reduced efficacy offered by the vaccine and not as a result of any identified safety concern,” the company said in a statement. GSK’s North American headquarters is in Research Triangle Park.
GSK sent a letter notifying about 1,000 U.S. customers – including wholesale distributors, pharmacies, government agencies and physicians – about the recall, the Associated Press reported.
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More than 99 percent of the vaccines were distributed last year, which was before the medication began losing potency, a company spokeswoman told the Associated Press.
The recall doesn’t apply to other varieties of FluLaval Quadrivalent vaccine.