Levonorgestrel
Postday One-Step is an emergency contraceptive medication designed to prevent pregnancy after unprotected intercourse or contraceptive failure. It is intended for use as a backup method of birth control and should not be used as a regular form of contraception. This single-dose oral tablet is most effective when taken as soon as possible after unprotected sex.
Emergency contraceptive pill used to help prevent unintended pregnancy after unprotected sex or contraceptive failure.
Key facts at a glance
- RxNorm
- 2049242
- Generic
- Postday One-Step
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Emergency contraception to prevent pregnancy following unprotected sexual intercourse, contraceptive failure (such as condom breakage or missed birth control pills), or sexual assault. It is not intended for use as a routine method of contraception and does not terminate an existing pregnancy.
Although the exact mechanism is not specified, emergency contraceptive pills of this type typically work by delaying or preventing ovulation, interfering with fertilization, or altering the uterine lining to prevent implantation. Postday One-Step is a single-dose formulation taken as one tablet.
This medication is most effective when taken within 72 hours (3 days) of unprotected intercourse, though effectiveness decreases over time. It does not protect against sexually transmitted infections (STIs). This product is intended for occasional emergency use and should not replace regular contraception. Side effects may include nausea, abdominal pain, fatigue, headache, or menstrual changes. Consult a healthcare provider if you have concerns about its use.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 9, 2026. · Read our editorial policy