Medicines have benefits and some have risks. Always read the label and use only as directed. If symptoms persist or you have side effects see your health professional. Brands and generics both contain the same active ingredient(s) and are medically equivalent. Some brands are marketed under different names by the same manufacturing country depending on the country of origin.
Regestrone (norethisterone) is a synthetic progestogen, or a progestin. Progestogen is a naturally-occurring hormone which, along with estrogen, is largely responsible for reproductive characteristics in women, influencing pregnancy, estrous, and menstrual cycles. A progestin is a synthetic version of progestogen that fills the same role.
Progestins or progestogens are always present in combined hormonal birth control, along with some form of estrogen. Regestrone is a progestin-only medication, however; it is not mixed with estrogen or any other medication. Progestin-only medications have a range of uses:
Equally important is who should not take Regestrone. Women with certain health conditions are at higher risk of experiencing severe side effects while taking this product and should seek an alternative treatment:
Men, young women who haven't had their first period, and post-menopausal women should not take Regestrone without explicit doctor instruction.
Regestrone comes in tablets of 5 mg strength; it is not available in other dosage amounts, so treatment often involves taking multiple tablets. Tablets can be taken without regard to food, though a full glass of fluid is recommended with each dose.
Dosage varies quite a bit according to what's being treated. Standard treatment guidelines for common uses are:
Something to keep in mind during treatment with Regestrone is that it doesn't stay in the body very long. It is critical that tablets be taken at the same time each day to maximize effects; a delay as little as 3 hours can nullify effects.
St. John's wort should be strictly avoided while taking Regestrone; potentially fatal interactions are possible. Though generally less dangerous, other medications may also interact with Regestrone, making it less effective. Always double-check with a doctor or pharmacist before mixing medications.