Important: This page is general information, not medical advice. It does not recommend or prescribe any treatment. Always consult your doctor or pharmacist before starting, stopping or changing any medicine.
Quick facts
- Drug class
- Progestin [EPC], Progestin-containing Intrauterine System [EPC]
- How it is given
- oral
- Type
- human otc drug
- Brand names
- PostDay One-Step
- RxNorm ID
- 483325
We do not publish dosing. How much of this medicine to take, how often, and for how long depends on your age, weight, kidney and liver function, other conditions and other medicines. That is a decision for the person who prescribes or dispenses it. Follow the directions on your own pack and ask your pharmacist if anything is unclear.
What it is used to treat
Use for women to reduce chance of pregnancy after unprotected sex (if a contraceptive failed or if you did not use birth control)
Warnings
Warnings Allergy alert: Do not use if you have ever had an allergic reaction to levonorgestrel Sexually transmitted diseases (STDs) alert: This product does not protect against HIV/AIDS or other STDs Do not use • if you are already pregnant (because it will not work) • for regular birth control Ask a doctor or pharmacist before use if you are taking efavirenz (HIV medication) or rifampin (tuberculosis treatment) or medication for seizures (epilepsy). These medications may reduce the effectiveness of levonorgestrel. When using this product you may have • menstrual changes • tiredness • breast pain • nausea • headache • vomiting • lower stomach (abdominal) pain • dizziness Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center right away. (1-800-222-1222)
Storing it safely
Other information • read the instructions, warnings, and enclosed product leaflet before use • this product works mainly by preventing ovulation (egg release). It may also prevent fertilization of a released egg (joining of sperm and egg) or attachment of a fertilized egg to the uterus (implantation). • do not use if carton is open or the blister seal is broken or missing • store at 20-25°C (68° to 77°F)
Keeping it away from children
Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center right away. (1-800-222-1222)
Other ingredients
Inactive ingredients silicon dioxide, corn starch, lactose monohydrate, magnesium stearate, potato starch, talc
Before you take anything new
Tell your pharmacist or doctor about every medicine you take — including ones bought without a prescription, herbal products and supplements. Interactions are one of the most common avoidable causes of harm from medicines, and a pharmacist can check your full list in a couple of minutes.
This page is built from the openFDA record of the U.S. Food and Drug Administration's approved labelling for this product, effective 23 April 2025. Label text has been shortened and reformatted for readability; safety wording has not been altered in meaning. FDA labelling describes products approved in the United States — brand names, strengths, formulations and approved uses may differ in your country. Always read the leaflet that comes with your own pack. PocketsInfo is not affiliated with, and is not endorsed by, the FDA. Retrieved 2026-07-30.