Levonorgestrel
Levonorgestrel is a synthetic hormone commonly used in both routine birth control pills and emergency preparations. It is a central option within Women’s Health, chosen for its efficacy in preventing pregnancy. This page lists 3 available formulations, including well-known brands like Alesse and Levlen, for your review.
Key points
- Prevents pregnancy by delaying egg release and thickening cervical mucus so sperm struggle to reach an egg.
- Serves two distinct roles: a daily component of routine contraception and a single higher dose for emergency use after unprotected sex.
- Certain anti-seizure medicines and specific antibiotics are known to interact with it, so current medications should be checked.
What is Levonorgestrel?
Levonorgestrel is a progestin, a synthetic form of the natural hormone progesterone. It is widely relied upon for family planning and pregnancy prevention. Because different manufacturers produce various formulations, you may encounter several brand names that share the same active ingredient but differ in their concentration or specific combination within a multi-phasic or monophasic pack.
What Levonorgestrel is used for
This hormone is indicated for Contraception, where it works as part of a daily oral regimen to suppress ovulation and alter cervical mucus. It is also used for Emergency Contraception, often referred to as the morning-after pill, to prevent pregnancy after unprotected intercourse or contraceptive failure.
How does Levonorgestrel work?
Levonorgestrel prevents pregnancy primarily by stopping or delaying the release of an egg from the ovaries. It also thickens the mucus at the cervix, which makes it harder for sperm to travel through the female reproductive tract to reach an egg. Effectively, it creates a physiological state that is unfavourable for fertilisation and implantation.
Levonorgestrel brands and forms
You will find this medication in tablet form, ranging from daily oral contraceptive pills to higher-dose tablets designed for emergency use. Prominent brands like Microgynon 30, Rigevidon, Levest, and Levlen represent established options, alongside Alesse and Levonelle. Many patients compare these brands based on their availability and specific pack structure to find a formulation that aligns with their existing routine.
Safety overview for Levonorgestrel
What to check before using this medicine
Review your medical history, particularly any history of blood clots, liver disease, or undiagnosed vaginal bleeding. Ensure that the specific product formulation you choose is suitable for your long-term or emergency requirements.
Possible reactions and tolerability
Some individuals may experience changes in their menstrual cycle, nausea, or breast tenderness after use. These are common and often temporary adjustments associated with hormone-based treatments.
Interactions and health factors
Certain medications, including some anti-seizure drugs and specific antibiotics, can interact with hormonal preparations. Always cross-reference your current medications with the product information provided. Product labelling and verified clinical sources remain the correct references for specific contraindications, interactions and reactions.
Further reading
What is levonorgestrel used for?
Levonorgestrel is used for contraception, both as part of a daily oral regimen and as emergency contraception after unprotected intercourse or contraceptive failure. It is a synthetic hormone that helps prevent pregnancy.
How does levonorgestrel work?
Levonorgestrel works mainly by preventing or delaying the release of an egg from the ovaries. It also thickens the mucus at the cervix, which makes it harder for sperm to reach an egg. It does not disrupt an existing pregnancy.
How long does levonorgestrel take to work?
Levonorgestrel starts working within 2 hours.
What are the side effects of levonorgestrel?
Common side effects include nausea, fatigue, and headache, while moderate effects can include lower abdominal pain, dizziness, and breast tenderness. Changes in the menstrual cycle may also occur and are often temporary. Ectopic pregnancy is a serious side effect that requires immediate medical attention, so speak to a doctor or pharmacist if you are concerned.
Can levonorgestrel be taken with other medicines?
Levonorgestrel can interact with some medicines, including St John's wort, rifampicin, certain anti-seizure drugs, and specific antibiotics. Check your current medications with a doctor or pharmacist before use.
Who should not take levonorgestrel?
Levonorgestrel should not be used by anyone with a hypersensitivity to levonorgestrel. Review your medical history, particularly any history of blood clots, liver disease, or undiagnosed vaginal bleeding, and speak to a doctor or pharmacist to check whether it is suitable for you.
What levonorgestrel products are available?
Products containing levonorgestrel include Plan B, Alesse and Levlen. Compare forms, strengths and packs in the listings above.
What brand names is levonorgestrel sold under?
Besides the products listed here, levonorgestrel is sold under brand names such as Levonelle, Microgynon 30, Levest and Rigevidon. Names differ from country to country, so the active ingredient is the surest way to compare.
Can I buy levonorgestrel over the counter in Thailand?
Yes. Levonorgestrel is sold over the counter, and Yasabai does not ask for a prescription to order it. We are an online store, not a dispensing pharmacy; we arrange your order and delivery on your behalf.
Ordering without a prescription →Do you deliver levonorgestrel to Thailand?
Yes. Our pharmacy partners ship from India to Thailand and across Asia in discreet packaging. Standard Airmail takes up to 3 weeks; Express Tracked Courier takes up to 1 week.
How ordering works →Related articles
23 Sept 2026 ⋅ 6 min read
Women's Health in the Philippines: Contraception, Periods & Menopause Options
A respectful, practical guide to women's health in the Philippines: contraception and family planning, menstrual health, and menopause, what your options are, and where to get good care.
Read guide