Sources reports that Pfizer has recalled over one million packets of birth control pills, varying in brand name and potency, due to a packaging error which could lead to users falling pregnant rather than preventing it.

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According to the pharmaceutical company, the recall applies to packets that were accidentally shipped with too many or too few active tablets. The imbalance in proper dosage of the drugs is not dangerous, but may elevate the chance a woman taking these pill would become pregnant.

To see if your packet of Pfizer birth-control pills is being recalled, review the list of lot numbers on the FDA website.