Julie is essentially the same medication as Plan B One-Step. Both are single-dose emergency contraceptive tablets containing 1.5 mg of levonorgestrel, and they work the same way in your body. Julie is an FDA-approved generic equivalent of Plan B, approved through the same regulatory pathway used for all generic drugs, meaning it had to demonstrate that it delivers the same active ingredient at the same dose with the same effect. The main differences come down to price and the company behind the brand.
Same Drug, Same Dose, Same Effect
Both Julie and Plan B One-Step contain exactly 1.5 mg of levonorgestrel, a synthetic hormone that has been used in various contraceptive products for decades. Julie received FDA approval through what’s called an Abbreviated New Drug Application (ANDA), which is the standard process for generics. This means the FDA confirmed it is pharmaceutically equivalent to Plan B One-Step before it could be sold.
Because the active ingredient and dosage are identical, Julie carries the same effectiveness numbers. When taken within the first 24 hours after unprotected sex, levonorgestrel-based emergency contraception is around 94% effective at preventing pregnancy. That number drops to about 58% by the 72-hour mark, which is the outer limit of its recommended window. The sooner you take it, the better it works, regardless of which brand is on the box.
How Levonorgestrel Prevents Pregnancy
There’s been longstanding confusion about how the morning-after pill works, partly because older labels included language about implantation. The FDA has since reviewed the evidence and updated the labeling. The conclusion: levonorgestrel works by delaying or blocking ovulation. It interrupts the hormonal surge that triggers the release of an egg. If ovulation has already happened, the pill does not appear to reduce the chance of pregnancy at all.
The FDA specifically removed references to effects on fertilization and implantation from the labeling after determining those mechanisms were not supported by the best available science. The drug does not have a meaningful effect on the uterine lining, and studies have not shown that it interferes with sperm reaching an egg once ovulation has occurred.
Price Is the Biggest Practical Difference
Plan B One-Step typically costs between $38 and $44 for a single tablet at retail pharmacies. Julie was launched with the explicit goal of being a more affordable option. Exact pricing varies by store, but Julie is generally positioned well below the Plan B price point.
Julie also runs a 1-for-1 donation program: for every pill purchased at a retail store, the company donates one pill to be distributed for free through partner organizations. This program has made emergency contraception available at no cost in some states where access is limited. Both products are available over the counter without a prescription or age restriction.
Side Effects Are Identical
Because you’re taking the same drug at the same dose, the side effect profile for Julie and Plan B is the same. The most commonly reported effects include nausea, lower abdominal pain, tiredness, headache, dizziness, and breast tenderness. Your next period may come earlier or later than expected, and it may be heavier or lighter than usual. These effects are temporary.
If you vomit within two hours of taking either pill, the dose may not have been fully absorbed, and you may need to take another one. A period that’s more than a week late after taking the pill could indicate pregnancy.
Weight Can Affect How Well It Works
One important limitation applies equally to Julie and Plan B. Research suggests that levonorgestrel-based emergency contraception becomes less effective in people with a BMI above 26 or a body weight above about 155 pounds (70 kg). This doesn’t mean the pill won’t work at all at higher weights, but the reduction in effectiveness is significant enough that clinical guidelines suggest considering a different type of emergency contraception called ulipristal acetate, which maintains higher effectiveness up to 120 hours after sex and is less affected by body weight. A copper IUD inserted within five days is another highly effective alternative regardless of weight.
When Julie Might Be the Better Choice
If you’re choosing between Julie and Plan B at the pharmacy, the decision is straightforward. They are the same medication with the same results, so whichever one is cheaper or in stock is the better pick. There is no clinical reason to prefer one over the other. Some people specifically choose Julie because of its donation model, but that’s a values-based decision, not a medical one.
The more important choice is whether levonorgestrel is the right type of emergency contraception for your situation. If more than 72 hours have passed since unprotected sex, or if your BMI is above 26, a different option may be more effective. Timing matters more than the brand on the label.