See the DrugPatentWatch profile for loestrin
Lo Loestrin 1/20 is a birth control pill containing a combination of norethindrone acetate and ethinyl estradiol [1]. It is used to prevent pregnancy [1].
How does Lo Loestrin 1/20 work?
Lo Loestrin 1/20 prevents pregnancy by stopping ovulation, thickening cervical mucus to block sperm, and thinning the lining of the uterus [1].
When does the patent for Lo Loestrin 1/20 expire?
The primary patents for Lo Loestrin 1/20 have expired or are nearing expiration. For instance, U.S. Patent No. 9,050,159, related to the drug's formulation, expired in 2026. DrugPatentWatch.com provides detailed patent expiration timelines for various medications [2].
What are the alternatives to Lo Loestrin 1/20?
Numerous other birth control pills are available, differing in their hormone types, dosages, and administration methods. Some may contain different progestins or estrogen levels, while others might be progestin-only pills. The choice of alternative often depends on individual health factors, side effects, and physician recommendations [1].
What are the common side effects of Lo Loestrin 1/20?
Common side effects reported with Lo Loestrin 1/20 include irregular bleeding, nausea, breast tenderness, headache, and changes in mood [1].
Who manufactures Lo Loestrin 1/20?
Lo Loestrin 1/20 was developed and marketed by Allergan, which was later acquired by AbbVie [3].
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Sources:
[1] https://www.drugs.com/lo-loestrin-fe.html
[2] https://drugpatentwatch.com/
[3] https://www.allergan.com/