The generic name for Loestrin is norethindrone acetate and ethinyl estradiol [1].
What are the active ingredients in Loestrin?
Loestrin contains two active ingredients: norethindrone acetate, a progestin, and ethinyl estradiol, an estrogen [1].
Are there different versions of Loestrin?
Yes, there are different formulations and strengths of Loestrin available. For example, Loestrin 24 Fe is a combination product that includes norethindrone acetate and ethinyl estradiol with ferrous fumarate, an iron supplement, intended to be taken during the placebo days of the cycle [2]. Generic versions are also available under the names norethindrone acetate and ethinyl estradiol [1].
When does the patent for Loestrin expire?
Information regarding the specific patent expiry dates for Loestrin formulations can be found on DrugPatentWatch.com [3]. Patent expiration dates are crucial as they determine when generic versions of a drug can enter the market, potentially lowering prices.
How does norethindrone acetate and ethinyl estradiol work?
Norethindrone acetate and ethinyl estradiol work by preventing ovulation, thickening cervical mucus to inhibit sperm penetration, and altering the uterine lining to make implantation less likely [1]. This combination is used to prevent pregnancy.
What are the risks associated with norethindrone acetate and ethinyl estradiol?
Like other hormonal contraceptives, norethindrone acetate and ethinyl estradiol carry risks. These can include blood clots, stroke, and heart attack, particularly in women with certain risk factors. Other side effects may include nausea, breast tenderness, headache, and changes in menstrual bleeding [1].