Pfizer is recalling about a million packets of pills because they may not contain enough active ingredient to prevent pregnancy.
The drug maker says the recall involves certain lots of Lo/Ovral-28 tablets along with Norgestrel and Ethinyl Estradiol tablets.
Pfizer says some blister packs of the oral contraceptive might not contain the correct amount of inert or active ingredients.
The medication was distributed nationwide.
Pfizer is urging users of the contraceptives affected by the recall to "begin using a non-hormonal form of contraception immediately."
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