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Oral Contraceptive Preparation
Definition 1
Orally administered synthetic sex hormones with contraceptive activity. The oral contraceptive preparation contains a combination of an estrogen, such as ethinyl estradiol, and a progestagen, such as levonorgestrel or norethidrone. The oral contraceptive prevents pregnancy by preventing ovulation and by inducing endometrial and cervical changes undesirable for fertilization and implantation. (NCI Thesaurus)
Definition 2
A pill used to prevent pregnancy. It contains hormones that block the release of eggs from the ovaries. Most birth control pills include estrogen and progestin. (NCI Dictionary)
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