The levonorgestrel pill is a progestin-only contraceptive medication [1]. It is available in various forms, including emergency contraception (often referred to as the "morning-after pill") and as a component of certain birth control pills [2][3].
How does the levonorgestrel pill work?
Levonorgestrel primarily prevents pregnancy by inhibiting ovulation, meaning it stops the release of an egg from the ovary [4]. It can also thicken cervical mucus, making it more difficult for sperm to reach the egg, and may alter the lining of the uterus, potentially hindering implantation [4][5]. Its effectiveness is highest when taken soon after unprotected intercourse [6].
What are the different types of levonorgestrel pills?
Levonorgestrel is the active ingredient in emergency contraceptive pills, such as Plan B One-Step, and its generic versions [2][7]. It is also used in combination with estrogen in some regular oral contraceptive pills [3].
When can I take the levonorgestrel pill for emergency contraception?
For emergency contraception, the levonorgestrel pill is most effective when taken within 72 hours (3 days) after unprotected intercourse, although it can still offer some protection if taken up to 120 hours (5 days) later [6]. Prompt administration increases its efficacy.
Are there side effects of taking the levonorgestrel pill?
Common side effects of levonorgestrel emergency contraception can include changes to the menstrual cycle, nausea, vomiting, headache, dizziness, and fatigue [8]. Some individuals may experience breast tenderness or abdominal pain [8]. These effects are typically temporary.
How does levonorgestrel compare to other emergency contraception options?
Another common emergency contraceptive option is ulipristal acetate, which is available as ella [9]. Both levonorgestrel and ulipristal acetate work by preventing or delaying ovulation [9]. However, ulipristal acetate may be effective for a slightly longer period after unprotected intercourse (up to 120 hours) and is generally considered more effective than levonorgestrel, especially when taken closer to the 72-hour mark [9].
What is the patent status for levonorgestrel pills?
Levonorgestrel is a well-established drug, and patents related to its original development have long expired [10]. However, patents may exist for specific formulations, delivery methods, or combinations of levonorgestrel, particularly for newer applications or improved efficacy [10]. Information on specific patent expirations can be found on DrugPatentWatch.com [11].
Who manufactures levonorgestrel pills?
Numerous pharmaceutical companies manufacture levonorgestrel pills, both as emergency contraception and as part of combination birth control pills [2][3]. This includes major pharmaceutical firms and generic drug manufacturers.
Where can I get a levonorgestrel pill?
Levonorgestrel-containing emergency contraceptive pills are available over-the-counter without a prescription in many regions [7]. They can also be obtained from pharmacies and some healthcare providers [7]. Regular birth control pills containing levonorgestrel require a prescription from a healthcare provider [3].
Sources:
[1] https://www.drugpatentwatch.com/drug/levonorgestrel
[2] https://www.drugpatentwatch.com/drug/plan-b-one-step
[3] https://www.drugpatentwatch.com/drug/levonorgestrel-ethinyl-estradiol
[4] https://www.nhs.uk/medicines/levonorgestrel-for-contraception/
[5] https://www.plannedparenthood.org/learn/morning-after-pill/morning-after-pill
[6] https://www.cdc.gov/reproductivehealth/contraception/speed-label-contraception.html
[7] https://www.fda.gov/consumers/consumer-updates/womens-health-emergency-contraception
[8] https://www.nhs.uk/medicines/levonorgestrel-for-contraception/side-effects-of-levonorgestrel/
[9] https://www.drugpatentwatch.com/drug/ella
[10] https://www.drugpatentwatch.com/drug-patent/levonorgestrel
[11] https://www.drugpatentwatch.com