Levonorgestrel

What levonorgestrel is, in one paragraph

Levonorgestrel is a synthetic progestin, a lab-made hormone that behaves like the body’s own progesterone. In the United States it appears in three very different products: a single-dose emergency contraceptive tablet sold without a prescription, a prescription combined birth control pill that pairs it with an estrogen called ethinyl estradiol, and a prescription intrauterine device that releases it slowly inside the uterus.

All three are used to prevent pregnancy. They are not interchangeable. The emergency tablet is a one-time backup after unprotected sex. The daily pill and the intrauterine device are ongoing methods. None of them protect against HIV or other sexually transmitted infections, so barrier methods still matter.

To answer the question people most often type: this is a progestin, not an estrogen. Progestin is the general name for man-made versions of progesterone. The confusion is understandable, because the prescription pill versions combine the progestin with an estrogen in the same tablet. The emergency tablet and the intrauterine device contain the progestin alone.

Because the same ingredient shows up in over-the-counter, prescription, and device form, the safety picture is not one single list. What is risky in a daily combined pill may not apply to one emergency dose. This guide separates them so the caution lands where it belongs. You can compare the hormone with other options in our Full Medication Index.

How the hormone works in the body

The mechanism depends on the product. Used as emergency contraception, the main job is to stop or delay ovulation. It blunts the hormonal surge that releases an egg. No egg released means no egg to fertilize. The US Food and Drug Administration is clear on this point in its consumer information on the 1.5 mg emergency tablet: it works mainly by preventing the release of an egg, and it is not effective if you are already pregnant. It does not end an established pregnancy.

Timing is the whole game with the emergency dose. Labeling directs a single tablet as soon as possible within 72 hours of unprotected sex or contraceptive failure. Effectiveness drops the longer you wait, which is why clinicians talk about hours rather than days. It starts affecting hormone signals quickly, but you will not feel it working, and there is no test to confirm it did its job. Your next period is the signal most people watch.

Daily combined pills work differently because they run continuously. They suppress ovulation month after month, thicken cervical mucus so sperm move less easily, and thin the lining of the uterus. The intrauterine version works mostly in the uterus itself, thickening mucus and thinning the lining, with less consistent effect on ovulation. That local action is why bleeding patterns change so much with the device.

How long does it stay in your system? Not long. Pharmacology reviews such as the NIH StatPearls chapter on this progestin describe a blood half-life of roughly a day after an oral dose, so most of a single tablet clears within a few days. It does not build up in the body over the long term, and it does not cause a lasting delay in fertility. After stopping a daily pill or removing the device, normal cycles generally return without a long waiting period.

What US labeling approves it for

The prescription combined tablet, sold under brand and generic names including Iclevia from Aurobindo Pharma, is approved for one purpose: use by females of reproductive potential to prevent pregnancy. That is the labeled indication, full stop. Clinicians sometimes use combined pills for other reasons, such as heavy or painful periods or acne, but those uses sit outside this particular product’s approval and belong in a conversation with a prescriber rather than a web page.

The over-the-counter tablet is approved as emergency contraception after unprotected sex or a known birth control failure, such as a slipped condom or several missed pills. It is not designed as a routine method. Regular use is less effective than an ongoing method and causes more cycle disruption.

Intrauterine systems that release this progestin are approved to prevent pregnancy for a set number of years, and the approved duration differs by product. Some are also approved to treat heavy menstrual bleeding. Because those details vary product by product, check the specific labeling rather than assuming one device matches another.

Search interest often mixes up the brand-name emergency pill with its generics. They are separate packages, not separate drugs. A store-brand emergency tablet with the same active ingredient and the same single-dose strength is held to the same FDA standards as the brand. Patient-facing references such as the MedlinePlus entry for this medicine treat them together for that reason.

Side effects people actually report

Most side effects are short-lived and not dangerous, but they differ by product. With a single emergency dose, the common complaints are nausea, tiredness, headache, dizziness, breast tenderness, lower belly cramping, and a period that arrives early or late. Spotting between periods happens. If your period is more than a week late, a pregnancy test is the sensible next step.

With daily combined pills, the pattern is different because the exposure continues. Breakthrough bleeding and spotting are common in the first months and often settle. Nausea, breast tenderness, headache, mood changes, bloating, and skin darkening on the face can occur. Some people stop having withdrawal bleeding at all, which the labeling treats as an expected possibility rather than a problem in itself. Reference summaries such as the Mayo Clinic drug page for the oral form list these in more detail.

Intrauterine devices bring their own list. Irregular bleeding and spotting are very common in the first months. Some people end up with much lighter periods or none. Cramping, ovarian cysts, and back pain occur. Insertion itself can cause pain and brief dizziness. Less commonly the device can be expelled, embed in the uterine wall, or perforate it during placement. Pelvic infection risk is highest in the weeks after insertion. If pregnancy does happen with a device in place, the chance that it is ectopic, meaning outside the uterus, is higher, and that is a medical emergency.

Long-term concerns come up a lot in searches. For a single emergency dose, there is no established long-term harm. For continuous combined pills, the meaningful long-term issues are vascular and are covered in the next section, along with gallbladder disease and blood pressure changes. Weight change is often blamed on hormonal contraception; the evidence for a consistent, large effect is weaker than the internet suggests, and individual experiences vary.

Who should avoid combined pills, and why

This is where the strongest warning sits. Combined oral contraceptives carry a boxed warning, the most serious warning the FDA requires, about cigarette smoking and serious cardiovascular events. Smoking raises the risk of events like heart attack and stroke on these pills, and that risk climbs with age and with the number of cigarettes. Because of it, combined pills are contraindicated in women over 35 who smoke. The full prescribing information on the DailyMed label archive states this plainly, and it is not a soft suggestion.

The other labeled precautions follow the same theme of blood vessels, liver, and blood pressure:

• Blood clots: treatment stops if a clot in a vein or artery occurs. Labeling also directs stopping at least four weeks before major surgery and staying off for two weeks after, because immobility raises clot risk.
• After childbirth: starting no earlier than four weeks after delivery in people who are not breastfeeding, again because of clot risk.
• Cardiovascular risk factors: these are weighed before starting in anyone, and especially in people over 35.
• Liver disease: the pill is discontinued if jaundice, a yellowing of skin or eyes, appears.
• High blood pressure: if used at all in well-controlled hypertension, blood pressure is monitored and the pill stops if it rises significantly.
• Gallbladder disease: combined pills may cause it or worsen existing disease.

Other situations that usually rule out combined pills include a personal history of blood clots or clotting disorders, migraine with aura, current or past breast cancer, certain liver tumors, undiagnosed abnormal vaginal bleeding, and known pregnancy. Clinicians work from published eligibility criteria rather than guesswork; the CDC contraception guidance for clinicians is the reference many use to match a method to a medical history.

The emergency tablet is a different risk profile. A single dose is not held to the same restrictions as years of combined pills, and it is sold over the counter for that reason. It is still not the right tool if you are already pregnant, since it will not work, and it is not intended as your regular method. Professional patient resources such as the ACOG explainer on emergency contraception set out the practical limits.

Interactions that can quietly lower protection

The most important interactions do not make you sick. They make the contraception fail. Several medicines speed up how the liver clears these hormones, which lowers blood levels and can reduce protection against pregnancy. That applies to the emergency dose and to daily pills.

Categories to raise with a prescriber or pharmacist include:

• Rifampin and related antibiotics used for tuberculosis.
• Some seizure medicines, including carbamazepine, phenytoin, phenobarbital, and topiramate.
• Certain medicines for HIV and hepatitis C. One hepatitis C combination containing ombitasvir, paritaprevir, and ritonavir is contraindicated with these pills because of the risk of liver enzyme elevations.
• St John’s wort, an herbal product many people do not think to mention.
• Ulipristal, another emergency contraceptive. Taking the two types close together can make each work less well.

Interactions run the other direction too. Combined pills can lower blood levels of lamotrigine, a seizure medicine, and can change thyroid hormone binding so that some people on thyroid replacement need their dose reviewed. None of that is a reason to panic, and none of it is a reason to self-adjust. It is a reason to hand over a complete list of everything you take, including supplements, before starting.

If you take a liver enzyme inducer and need emergency contraception, say so at the point of care. A clinician may suggest a different approach. That conversation is quick and it changes the outcome.

Forms, brands and what separates them

Product names shift by manufacturer and by retailer, so it helps to think in categories rather than brands. The single-dose emergency tablet is sold under the original brand name and under many store and generic labels. Combined daily pills come in monthly packs and in extended-cycle packs designed to give fewer scheduled bleeds per year. Intrauterine systems differ in hormone amount, size, and approved duration.

Two practical notes. First, extended-cycle combined packs are not stronger, they simply rearrange when a withdrawal bleed happens. Second, an intrauterine device cannot be prescribed and mailed to you for self-insertion. Telehealth can start the conversation, but a clinician places the device.

What it costs without insurance

Cost depends entirely on which of the three products you mean, and that is the single biggest source of confusion here. An over-the-counter emergency tablet is bought off the shelf. Store-brand versions carry the same active ingredient and single-dose strength as the brand and are usually cheaper, which is the clearest way to reduce that particular out-of-pocket cost. Some clinics and health departments provide it at reduced or no cost.

Ongoing methods are billed differently. Telehealth contraception programs typically charge a recurring monthly plan or membership fee, and medication may be included in that fee or billed separately by the fulfilling pharmacy. Across the self-pay programs tracked in our directory, the lowest recurring monthly figure is $15 and the highest is $40. Advertised self-pay prices move often, so treat any figure as a snapshot and confirm it at checkout before you commit.

The things that actually move a monthly number are worth knowing:

• Whether the fee covers the consultation, refills, and messaging, or only the visit.
• Whether medication cost is bundled or charged on top by the pharmacy.
• Brand versus generic pack, and how many months ship at once.
• Introductory pricing versus the renewal rate after the first cycle.
• Shipping and any lab or blood pressure check the program requires.

A recurring fee is easy to underestimate over a year. Run the annual figure before you sign up rather than after.

On insurance, be careful with promises. Federal rules require most private plans to cover FDA-approved contraceptive methods without cost sharing, but the details of which specific products a plan covers, and what paperwork it wants, vary by plan and by state. The KFF fact sheet on private insurance coverage of contraception is a useful primer on where the gaps sit, including how coverage of over-the-counter emergency contraception often depends on having a prescription. Verify with your own plan before you assume anything, and compare the plan route against the cash route with real numbers.

If you want the cash-versus-plan comparison written out for your own situation, the Sample Savings Report shows the format, and other Free Health Calculators cover related metrics like blood pressure averages.

How telehealth programs handle contraception

Prescribing rules are set state by state, which is why two programs can look identical and still serve different maps. Most contraception platforms run an asynchronous intake: you complete a health questionnaire, report a recent blood pressure reading, and a licensed clinician in your state reviews it and decides whether a combined pill is appropriate. Some require a video visit instead. Neither model changes the labeled contraindications; a good intake is designed to catch them.

What varies between programs, and what is worth comparing before you pick one:

1. Blood pressure requirements. Because hypertension is a labeled precaution, programs differ on whether they accept a home reading, require a recent clinic reading, or refuse to prescribe combined pills without one.
2. Which products they carry. Some stock a wide formulary of generics, others a narrow list. If you are already stable on a specific pack, ask before switching.
3. Refill and follow-up structure. How long a prescription runs before a re-check, and whether messaging a clinician costs extra.
4. Pharmacy fulfillment. Mail order versus a local pickup, and how quickly a first shipment moves.
5. State coverage. A program licensed in most states may still be closed in yours.
6. Whether they can bill insurance at all, or operate cash pay only.

You can see which platforms serve contraception and read patient reviews on the Telehealth Provider Directory. Reviews on this site are moderated, and what the ratings weigh is set out in the Provider Scoring Methodology. Our Independent Telehealth Analysis covers wider patterns in how these programs price and structure care.

Questions to ask, and when to seek urgent care

Bring a short list to the appointment. These get to the decisions that matter:

• Given my age, blood pressure, migraine history, and smoking status, is a combined pill appropriate, or should I look at a progestin-only method?
• Do any of my current medicines or supplements make this method less reliable?
• What bleeding changes should I expect in the first three months, and when does that stop being normal?
• How soon does this method start protecting me, and do I need a backup for the first days?
• If I use emergency contraception while on an ongoing method, what do I do next?
• What happens at follow-up, and who do I contact when something feels off?
• What is the total monthly cost after any introductory period, and what is not included?

Some symptoms need immediate attention rather than a message. Emergency care is warranted for sudden shortness of breath, chest pain, coughing up blood, severe or sudden leg pain or swelling, sudden severe headache unlike your usual pattern, sudden vision loss or slurred speech, weakness on one side of the body, severe belly pain, or yellowing of the skin or eyes. Those can signal a clot, a stroke, a liver problem, or, with an intrauterine device, an ectopic pregnancy. Call 911 or go to an emergency department. Do not wait for a callback.

Less urgent but still worth a same-week call: a period more than a week late after emergency contraception, vomiting within a couple of hours of taking a tablet, repeated missed pills, a blood pressure reading that has climbed, new severe headaches, or device strings you can no longer feel.

Authoritative sources

These are the primary references behind this page. For the regulator’s consumer summary of the single-dose emergency tablet, including its nonprescription status, see the FDA information page on the 1.5 m