Birth control pills - progestin only: MedlinePlus Medical Encyclopedia
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National Institutes of Health
National Institutes of Health Birth control pills - progestin only
Birth control pills help keep you from getting pregnant. The pills with only progestin come in 28-day packs. Every pill is active. Each has only progestin, and no estrogen.
Progestin-only pills work by making your mucus too think for the sperm to move through.
Progestin-only pills work by making your mucus too think for the sperm to move through.
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