Yes, Plan B One-Step is available over the counter in the United States with no prescription and no age restrictions. The FDA approved it for nonprescription sale to all ages on June 20, 2013, and that status applies to all generic versions as well. You can walk into a pharmacy, grocery store, or big-box retailer and buy it off the shelf the same way you’d buy cold medicine. No ID is required.
Where to Buy It and What It Costs
Plan B and its generics are stocked in the family planning aisle or near the pharmacy counter at most major retailers, including CVS, Walgreens, Walmart, and Target. Some stores keep it in a locked case to prevent theft, which means you may need to ask an employee to open the case, but you still don’t need a prescription or approval from the pharmacist.
Brand-name Plan B One-Step typically costs $40 to $50. Generic versions cost significantly less, sometimes as little as $11. Common generics include Take Action, My Way, Aftera, Option 2, Preventeza, My Choice, and EContra. They all contain the same active ingredient at the same dose, so they work identically.
Insurance coverage is more complicated. The Affordable Care Act requires most health plans to cover the full range of FDA-approved contraceptives, including emergency contraception. In practice, many insurers will reimburse you for an OTC purchase if you have a prescription on file, even though you don’t need one to buy it. If cost is a concern and you have insurance, it’s worth calling your plan to ask how to get reimbursed.
How It Works
Plan B contains a single dose of levonorgestrel, a synthetic hormone that prevents or delays ovulation. If your body hasn’t released an egg yet, the pill keeps that from happening so sperm have nothing to fertilize. It does not end an existing pregnancy. If a fertilized egg has already implanted, taking Plan B will not affect it.
Timing Changes Effectiveness Dramatically
The sooner you take Plan B after unprotected sex, the better it works. Taken within the first 24 hours, it prevents pregnancy about 94% of the time. By 72 hours (three days), that number drops to roughly 58%. After 72 hours, it is not recommended because its effectiveness continues to fall. This is why keeping a box at home can be a practical decision: having it on hand eliminates the delay of driving to a store.
If you store it ahead of time, Plan B has a four-year shelf life. Keep it in a cool, dry place at room temperature (roughly 68 to 77 degrees Fahrenheit). A bedroom drawer or closet works well. Avoid the bathroom, where heat and moisture from showers can degrade the medication faster.
Side Effects
Most side effects are mild and short-lived. The most common ones are headache, nausea, and cramping similar to period pain. Your next period may come a few days early or late, and the flow may be heavier or lighter than usual.
If you vomit within two hours of taking the pill, it may not have been fully absorbed. In that case, you likely need to take another dose. A pharmacist can help you decide.
Weight Can Affect How Well It Works
Plan B becomes significantly less effective at higher body weights. Research from Oregon Health & Science University found that people with a BMI of 30 or above experienced morning-after pill failure four times as often as those with a BMI under 25. Blood levels of the active ingredient were about 50% lower in people with a BMI of 30 after a standard dose, meaning it may never reach the concentration needed to block ovulation. Doubling the dose does not solve the problem.
If your BMI is 30 or higher, a prescription alternative called ella (ulipristal acetate) is more effective. It also works over a longer window: up to five days (120 hours) after unprotected sex, compared to Plan B’s three-day limit. The tradeoff is that ella requires a prescription, so you’ll need to contact a healthcare provider or use a telehealth service to get it.
Plan B vs. Ella at a Glance
- Plan B (levonorgestrel): Over the counter, no prescription, no age restriction, no ID. Effective up to 72 hours. Costs $11 to $50 depending on brand or generic.
- Ella (ulipristal acetate): Requires a prescription. Effective up to 120 hours. Better option for people with a higher BMI.
Both options are emergency contraceptives, not routine birth control. They’re designed as a backup when regular contraception fails or wasn’t used. Neither protects against sexually transmitted infections.