JON STOKES / SCIENCE PHOTO LIBRARY JON STOKES / SCIENCE PHOTO LIBRARY
Contraceptive pills. Packets of the oral contraceptive Loestrin. These pills contain norethisterone acetate, also known as norethindrone acetate, which is a form of progestin, a synthetic progesterone hormone. The days of the week are printed on the packet to help the patient remember to take the pills.
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