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Is Plan B an abortion pill?

Medically reviewed by Kristianne Hannemann, PharmD. Last updated on July 9, 2025.

Official Answer by Drugs.com

No, Plan B is not an abortion pill. It is a type of emergency contraception that can prevent pregnancy from occurring. Plan B works best to lower the chance of becoming pregnant when it is taken as soon as possible, within 72 hours, after unprotected sex. The use of Plan B does not prevent 100% of pregnancies.

What Is Plan B and How Does It Work?

Plan B, often called the “morning-after pill,” is an emergency contraception tablet used to prevent pregnancy after unprotected sex or birth control failure. It contains levonorgestrel, a hormone that works mainly by delaying ovulation. This means it helps prevent the release of an egg, so fertilization cannot occur.

Plan B works by blocking the surge of luteinizing hormone, which usually happens before ovulation occurs (when your ovary releases an egg). This delays or stops ovulation. Additionally, Plan B thickens cervical mucus, which interferes with how well sperm can move and reach the released eggs.

Is Plan B the Same as the Abortion Pill?

No, Plan B is not an abortion pill. The abortion pill, also known as medication abortion, typically refers to mifepristone and misoprostol, which are used to end an existing pregnancy. Plan B cannot terminate a pregnancy that has already started; it only works before pregnancy occurs.

While both Plan B and the abortion pill contain hormones, they have different mechanisms of action and serve distinct purposes.

Does Plan B Work if the Egg is Already Fertilized?

No. Plan B will not work if you are already pregnant (when a fertilized egg has attached to the lining of your uterus). Plan B temporarily stops ovulation, so that sperm cannot fertilize the egg. If you have already ovulated, Plan B will not work to prevent pregnancy. It also does not increase the risk of having a miscarriage, nor does it affect your ability to get pregnant in the future.

Common Questions About Plan B and Abortion Pills

What Are the Names of Abortion Pills?

Mifepristone and misoprostol are the most common medications used for medical abortion. Other terms you might see: “pregnancy stop tablets,” “pregnancy remove tablet,” or “termination pills.”

Related questions

Can You Buy Abortion Pills Over the Counter?

Myth-Busting: Plan B vs. Abortion Pills

Myth: Plan B Causes Abortion

Myth: Plan B and Abortion Pills Are Interchangeable

Key Differences: Plan B vs. Abortion Pills

Plan B (Levonorgestrel) Abortion Pill (Mifepristone, Misoprostol)
Purpose Prevents pregnancy Ends established pregnancy
When to Use Within 72 hours of sex Up to 10 weeks after conception
Prescription Needed? No (OTC) Yes
Will it end a pregnancy? No Yes

Frequently Asked Questions

What Are the Side Effects of Plan B?

How Effective Is Plan B?

Can Plan B Be Used More Than Once?

Key Takeaways

This is not all the information you need to know about Plan B (levonorgestrel) for safe and effective use and does not take the place of your doctor’s directions. Review the full product information and discuss this information and any questions you have with your doctor or other health care provider.

References
  1. National Library of Medicine. July 2022. Levonorgestrel (Plan B One-Step®). In: Mother To Baby | Fact Sheets [Internet]. Accessed on August 20, 2024 at https://www.ncbi.nlm.nih.gov/books/NBK583410/
  2. Plan B One-Step [package insert]. Updated January 2023. Foundation Consumer Healthcare LLC. Accessed on August 20, 2024 at https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=6ce6b40e-14ac-47bd-a648-ddf9e452e559
  3. Plan B One-Step. Frequently Asked Questions. Accessed on July 9, 2025 at https://www.planbonestep.com/faqs/
  4. Planned Parenthood Federation of America. Updated April 2016. The Difference Between the Morning-After Pill and the Abortion Pill. Accessed on August 20, 2024 at https://www.plannedparenthood.org/files/3914/6012/8466/Difference_Between_the_Morning-After_Pill_and_the_Abortion_Pill.pdf
  5. The American College of Obstetricians and Gynecologists. 2020. Medication Abortion Up to 70 Days of Gestation. Accessed on July 9, 2025 at https://www.acog.org/clinical/clinical-guidance/practice-bulletin/articles/2020/10/medication-abortion-up-to-70-days-of-gestation
  6. The American College of Obstetricians and Gynecologists. January 2023. What is the difference between abortion pills and morning-after pills? Accessed on August 20, 2024 at https://www.acog.org/womens-health/experts-and-stories/ask-acog/what-is-the-difference-between-abortion-pills-and-morning-after-pills
  7. Vrettakos, C., et. al. May 2023. Levonorgestrel. In: StatPearls [Internet]. Accessed on August 20, 2024 at https://www.ncbi.nlm.nih.gov/books/NBK539737/

Read next

Can you drink alcohol after taking Plan B?

Yes. After taking the emergency contraceptive Plan B (levonorgestrel), it is considered safe to drink alcohol, and alcohol is not known to alter the efficacy of Plan B. While consuming alcohol after Plan B is not considered dangerous, some of the potential side effects of Plan B may be worsened by alcohol. Continue reading

Does Plan B One Step work during ovulation?

No, Plan B One Step won’t work if you have already started ovulating because it works by temporarily stopping ovulation (when your ovary releases an egg for fertilization from sperm). Continue reading

How effective is Plan B and how late can you take it?

Plan B (levonorgestrel) is estimated to be 60% to 94% effective at preventing pregnancy when taken within 3 days (72 hours) after unprotected sex. Somewhere between 0.6% to 2.6% of women who take Plan B within this time frame will still become pregnant. Continue reading

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