How to Get the Morning After Pill: OTC and Rx Options

Levonorgestrel emergency contraception, sold as Plan B One-Step and numerous generic versions, is available over the counter at pharmacies across the United States with no prescription, no ID, and no age restriction. If you need a prescription option instead, ulipristal acetate (sold as ella) offers a wider window of effectiveness but requires either a visit to a provider or a telehealth consultation. Which route makes sense depends on how much time has passed since unprotected sex, your body weight, and what you can access quickly.

Buying Levonorgestrel Over the Counter

Since 2013, the FDA has allowed levonorgestrel emergency contraception to be sold without a prescription to anyone, regardless of age.¹ Before that, buyers under 17 needed a prescription, a policy that was widely criticized as politically rather than scientifically motivated.² Today, in theory, you can walk into any pharmacy and pick up a box the same way you would buy ibuprofen.

Plan B One-Step is the best-known brand, but generics like Take Action, My Way, and AfterPill contain the same single 1.5 mg dose of levonorgestrel and work identically. Generics tend to cost less, sometimes significantly so. Online retailers also carry levonorgestrel EC and can ship it directly to you, which is worth knowing if you want to keep a dose at home for future need. The pill is a single tablet taken as soon as possible after unprotected intercourse.

What “Over the Counter” Actually Looks Like in Practice

The legal reality and the pharmacy experience do not always match. A national survey of pharmacies found that while roughly 87% had emergency contraception in stock on the day they were contacted, only about 23% had it fully accessible on the shelf where a customer could simply grab it and pay.³ More than 40% of pharmacies that stocked it kept it behind the counter, requiring you to ask a pharmacist. Over half required some form of additional documentation to purchase it, despite no legal requirement for any.

These barriers matter because emergency contraception is time-sensitive. If a pharmacist tells you that you need an ID, that you are too young, or that the product requires a prescription, they are wrong. You are not obligated to show identification or prove your age to buy levonorgestrel EC in the United States. Knowing this ahead of time gives you leverage to push back if you encounter misinformation at the register. If one pharmacy gives you trouble, try another or buy online. Some people also find it less stressful to purchase EC in advance, before they need it, so the pressure of the moment does not compound any access difficulties.

When You Need a Prescription Instead

Ulipristal acetate, marketed as ella, is the other dedicated emergency contraceptive pill available in the U.S. Unlike levonorgestrel, it requires a prescription. You can get one from your regular doctor, an urgent care clinic, a Planned Parenthood or similar reproductive health center, or through a telehealth service. Several online platforms now offer consultations specifically for ella, with some able to issue a prescription and arrange pharmacy pickup or shipping the same day.

The main reason to seek out ella instead of grabbing Plan B off the shelf is timing. Levonorgestrel works best within the first 24 hours and becomes less reliable as time passes. Ulipristal acetate maintains its effectiveness for up to five days (120 hours) after unprotected sex. If you are approaching the 72-hour mark or have passed it, ella is the stronger choice among pills.

How Timing Changes Effectiveness

Both levonorgestrel and ulipristal acetate work primarily by delaying or preventing ovulation. The critical difference is how late in the ovulatory process each one can still intervene. Levonorgestrel has a narrow window: it works after the dominant follicle has been selected but before the hormonal surge that triggers ovulation has begun. Once that surge starts, levonorgestrel loses its ability to block ovulation. Ulipristal acetate can still suppress follicular rupture even when administered shortly before ovulation, a time when levonorgestrel is no longer effective.⁴

Clinical trials reflect this biological difference. In a large randomized trial, pregnancy rates among women who took their pill within 72 hours were about 1.8% for ulipristal acetate and 2.6% for levonorgestrel. Among women who took emergency contraception between 72 and 120 hours, all three pregnancies that occurred were in the levonorgestrel group; none were in the ulipristal acetate group.⁵ A meta-analysis of the available data suggests ulipristal acetate may be more effective than levonorgestrel from day one onward, with the advantage growing as the hours pass.⁶

The practical takeaway: if it has been less than 24 hours and you can easily get levonorgestrel, it is a reasonable and effective option. If more time has passed, especially beyond two days, ulipristal acetate is worth the extra step of getting a prescription. If you are past three days, ella is essentially the only pill option with meaningful evidence of effectiveness.

Body Weight and Emergency Contraception

This is an area where the evidence has real implications that do not get enough attention. Studies have found that levonorgestrel emergency contraception becomes significantly less effective as body weight increases. In one analysis, the estimated pregnancy rate climbed from about 1.4% among women weighing 65 to 75 kg (roughly 145 to 165 pounds) to over 6% in women weighing more than 75 kg.⁷ Statistical modeling in that study showed a steep increase in pregnancy risk starting around 70 to 75 kg, which means the concern is not limited to people who would be classified as obese.

A pooled analysis of World Health Organization data also found that a BMI over 30 was associated with substantially reduced levonorgestrel efficacy, though the researchers noted that most of the available studies included too few women at higher weights to pin down the exact magnitude of the problem.⁸ The evidence is messy enough that regulatory agencies have stopped short of placing a hard weight cutoff on levonorgestrel packaging. But the trend is consistent and concerning.

Ulipristal acetate appears to hold up somewhat better at higher body weights, though research on this point is not as extensive as anyone would like. For people who weigh more than about 165 pounds, ella or a copper IUD may be meaningfully more protective than Plan B. If you are in this weight range and considering your options, it is worth the extra effort to get a prescription or see a provider for an IUD rather than relying on the over-the-counter option alone.

The IUD Option

The most effective form of emergency contraception is not a pill at all. A copper IUD inserted within five days of unprotected intercourse prevents essentially 100% of expected pregnancies. In a recent trial, zero pregnancies occurred among 318 women who received a copper IUD for emergency contraception.⁹ The copper IUD works regardless of where you are in your menstrual cycle and is not affected by body weight, which makes it the strongest option for anyone who can access it in time.

What may surprise you is that levonorgestrel-releasing IUDs, long used only for ongoing contraception, are now showing promise for emergency use as well. A trial published in the New England Journal of Medicine found a pregnancy rate of just 0.3% with a levonorgestrel 52 mg IUD used as emergency contraception, which was statistically noninferior to the copper IUD.¹⁰ The levonorgestrel IUD prevented over 93% of expected pregnancies in the same trial population.⁹ This is relevant because many providers are more familiar with hormonal IUDs, and some people prefer the lighter periods that come with them over the heavier bleeding sometimes caused by copper IUDs.

The obvious barrier is that getting an IUD requires a clinical visit and an insertion procedure. You cannot do this at a pharmacy or through telehealth. But if you can get an appointment within the five-day window, an IUD offers the strongest protection and doubles as highly effective ongoing contraception for years afterward. Some clinics, including many Planned Parenthood locations and university health centers, can accommodate same-day or next-day IUD insertions for emergency purposes.

Side Effects You Should Expect

Emergency contraceptive pills are well tolerated by most people, but they do cause noticeable short-term changes. The most common side effects of both levonorgestrel and ulipristal acetate are nausea, headache, fatigue, and abdominal discomfort. These typically resolve within a day or two.

What catches more people off guard are the menstrual cycle changes. A study of 232 women who took levonorgestrel EC found that about 15% experienced intermenstrual bleeding, and there were statistically significant changes in cycle length, period duration, and the appearance of menstrual flow compared to what was normal for each person.¹¹ The nature of these changes depended on where in the cycle the pill was taken: taking it well before expected ovulation tended to shorten the cycle, while taking it after ovulation could delay the next period. The reassuring finding is that the majority of these changes disappeared by the following cycle.

If your period is more than a week late after taking emergency contraception, take a pregnancy test. A late period after EC is common and usually just a hormonal disruption, but confirming is important for peace of mind and planning.

The Yuzpe Method as a Fallback

Before dedicated emergency contraceptive products existed, doctors used regular combined oral contraceptive pills at higher doses for emergency purposes. This approach, known as the Yuzpe method, involves taking a specific number of combined estrogen-progestin pills in two doses 12 hours apart. It is less effective than levonorgestrel or ulipristal acetate, reducing the risk of pregnancy by an estimated 75% compared to doing nothing.¹² It also causes more nausea and vomiting than modern alternatives.

The Yuzpe method is worth knowing about because it uses pills that many people already have at home or can obtain quickly from a friend. If you cannot get to a pharmacy for Plan B and cannot see a provider for ella or an IUD, using the birth control pills you already have is better than using nothing. The specific number of pills required varies depending on the brand and hormone concentration, so you would need to look up your specific formulation. The effectiveness is highest when intercourse occurred early in the fertile window, before ovulation, with data showing it worked substantially better when sex occurred two or more days before ovulation compared to closer to the event.¹³

Keeping a Dose at Home

Given that emergency contraception works best the sooner you take it, there is a strong case for buying a dose in advance and keeping it in your medicine cabinet. Research supports this approach. A systematic review of advance-provision studies found that women who had EC on hand were two to seven times more likely to use it when they needed it.¹⁴ A randomized trial among teenage girls found that those given EC in advance used it roughly twice as often as those who had to seek it out, and they took it much sooner after unprotected sex: an average of about 14 hours compared to over 25 hours in the group without advance access.¹⁵

One concern that comes up often is whether having EC on hand encourages riskier behavior. The evidence says no. The systematic review found that advance provision did not change patterns of regular contraceptive use, condom use, or sexually transmitted infection rates.¹⁴ Having a fire extinguisher in your kitchen does not make you careless with the stove, and EC works the same way: it is insurance for when things go wrong, and having it accessible just means you can act faster.

Levonorgestrel pills have a shelf life of several years, so buying one now and storing it in a cool, dry place means it will likely still be effective if and when you need it. For ella, the prescription requirement makes advance provision trickier, though some people do get a prescription filled in advance and keep it at home.

Using Emergency Contraception More Than Once

There is a persistent idea that emergency contraception is something you should only use once or twice in your life, or that using it repeatedly is dangerous. Neither is supported by evidence. Levonorgestrel emergency contraception is safe to use more than once, even within the same menstrual cycle. Survey data have found that over half of women seeking emergency contraception had used it before, and more than a quarter of those had used it more than twice previously.¹⁶

That said, emergency contraception is less effective at preventing pregnancy than regular methods like an IUD, implant, or daily pill. If you find yourself reaching for EC repeatedly, that is a signal that your regular contraception is not working for your life, whether because of missed pills, condom problems, or inconsistent access. A conversation with a provider about a method that fits your routine better is worth having. But the reluctance to use EC “too often” should not stop you from using it when you need it. Taking the pill is always preferable to an unintended pregnancy.

A Quick Reference for Your Options

Knowing which route to take depends on your situation. Here is a practical breakdown:

Within 24 hours, easy pharmacy access: Levonorgestrel (Plan B or a generic) from the shelf or behind the counter. No prescription, no ID, no age limit.
24 to 72 hours, weight under about 165 pounds: Levonorgestrel is still a reasonable option. Ulipristal acetate (ella) is more effective if you can get a prescription quickly.
72 to 120 hours: Ella is the only pill with strong evidence of working this late. Get a prescription through a provider or telehealth.
Any time within 5 days, especially at higher body weights: A copper IUD is the most effective option if you can get a clinical appointment. A levonorgestrel IUD may also work and offers ongoing contraception with lighter periods.
No access to any of the above: The Yuzpe method using regular birth control pills is a last resort with lower effectiveness.

Emergency contraception works by delaying ovulation, not by disrupting an existing pregnancy. It will not cause an abortion and will not harm a pregnancy that has already implanted. If you are already pregnant when you take it, it simply will not do anything. This is a common misconception that sometimes prevents people from using it or causes providers to refuse to dispense it, but the pharmacology is clear: these are ovulation-blocking drugs, not abortifacients.¹⁷

Cost Without Insurance

The price of levonorgestrel EC at a retail pharmacy ranges from about $10 for a generic to around $50 for brand-name Plan B One-Step. Online retailers and bulk pharmacies sometimes sell generics for less. If you have insurance, the Affordable Care Act requires most plans to cover FDA-approved emergency contraceptive methods without cost sharing when obtained with a prescription, even for over-the-counter levonorgestrel. Getting a prescription for levonorgestrel from a provider and then filling it at the pharmacy can therefore be free, which is an underused workaround. Ella typically costs $40 to $65 at a pharmacy, though insurance covers it with a prescription in most cases.

Copper IUD insertion is more expensive upfront, often several hundred dollars without insurance. But because it doubles as long-term contraception lasting up to 10 to 12 years, the per-year cost is extremely low. Insurance almost always covers IUDs fully when used for contraception. If cost is a concern and you need EC urgently, community health centers and Title X-funded clinics often offer emergency contraception on a sliding fee scale or at no cost.