Can You Take Plan B While Breastfeeding? Safety, Effects & Guidance
A comprehensive look at using Plan B emergency contraception while breastfeeding, including safety, effects on milk and infants, and expert advice.
Can You Take Plan B While Breastfeeding?
Emergency contraception is a vital resource for women seeking to prevent unintended pregnancy, but for breastfeeding mothers, questions about safety and potential impacts on both milk supply and infant health are common. Plan B, which contains the active ingredient levonorgestrel, is one of the most widely used forms of emergency contraception. In this guide, we address whether Plan B is safe for breastfeeding mothers, review the science on its use during lactation, discuss possible side effects, and provide practical expert advice.
Understanding Emergency Contraception and Plan B
Emergency contraception is used to prevent pregnancy after unprotected sex or contraceptive failure. There are two main types of emergency contraceptive pills (ECPs):
- Pills containing levonorgestrel (Plan B One-Step, Take Action, etc.)
- Pills containing ulipristal acetate (ella, a prescription pill)
Plan B is available over-the-counter and is most effective when taken within 72 hours of unprotected intercourse, but it may prevent pregnancy if taken up to 5 days later, though efficacy declines with time. Levonorgestrel primarily works by preventing or delaying ovulation, making fertilization less likely.
Is It Safe to Take Plan B While Breastfeeding?
Current research and leading medical organizations agree that Plan B (levonorgestrel) is considered safe while breastfeeding. The World Health Organization, American College of Obstetricians and Gynecologists, and other authorities classify progestin-only ECPs, like levonorgestrel, as Category 1—meaning no restrictions for use while lactating. This classification is based on studies showing that:
- Levonorgestrel passes into breast milk in only very small quantities.
- There is no evidence of harm to breastfed infants, including no reported adverse effects on growth, development, or short-term health.
- No significant decrease in milk supply has been observed in clinical studies after maternal use.
How Does Plan B Affect Breast Milk and Babies?
The main concerns among nursing parents are whether Plan B affects the quality and quantity of breast milk or poses any risk to their infant. Here’s what research and expert opinion reveal:
- Levonorgestrel is excreted into breast milk in very low concentrations.
- The relative infant dose of levonorgestrel when a mother takes Plan B is far below the threshold considered safe (well under 10% of the maternal dose, often cited as an acceptable limit).
- No evidence of adverse effects on infant health has emerged in studies following maternal intake of emergency contraception.
- Breastfeeding can be continued seamlessly after taking Plan B; there is no need to interrupt or pause nursing.
- Mothers commonly resume breastfeeding within 8 hours of taking Plan B.
| Aspect | Levonorgestrel (Plan B) |
|---|---|
| Milk Supply | No significant reduction observed |
| Infant Outcomes | No evidence of harm; no reported adverse effects |
| Drug in Milk | Present in low quantities; safe for infants |
| Breastfeeding Interruption Needed? | No |
What About Other Emergency Contraceptives?
Ulipristal Acetate (ella)
Ulipristal acetate is a prescription emergency contraceptive. Studies suggest that a small amount passes into breast milk, but data is more limited than for levonorgestrel. Manufacturers and some guidelines recommend expressing and discarding breast milk for 24 hours after use, but the World Health Organization states breastfeeding mothers can use ulipristal if needed, since infant exposure is minimal.
Mifepristone-Containing ECPs
Emergency contraceptives containing mifepristone are generally not recommended for breastfeeding mothers due to potential safety concerns and lack of data.
Copper Intrauterine Device (IUD)
Copper IUDs are a non-hormonal alternative to ECPs and may be inserted within 5 days of unprotected intercourse. They offer immediate and ongoing protection and have no known negative effect on breastfeeding or breast milk.
Side Effects of Plan B While Breastfeeding
While adverse side effects in infants are not reported, breastfeeding mothers themselves may experience some mild side effects after taking Plan B, such as:
- Nausea or vomiting
- Headache
- Fatigue
- Irregular vaginal bleeding
- Dizziness
Rarely, some mothers report a temporary reduction in milk supply or their baby seeming a bit fussier, though these claims lack solid scientific backing and usually resolve quickly.
If milk supply seems reduced or the baby appears noticeably affected after maternal use, consult a healthcare provider for personalized support and alternate contraception advice.
Best Practices for Using Emergency Contraception While Breastfeeding
- Consult a healthcare provider or pharmacist about the best contraceptive methods for your situation, especially if you’re concerned about any specific risks.
- Do not overuse emergency contraception. It should only be used in genuine emergencies when other contraceptive methods were not used or failed.
- Monitor your milk supply and infant’s feeding behaviors after use, but rest assured that adverse effects are highly unlikely.
- Consider long-term birth control methods suitable for lactating parents, such as progestin-only pills, contraceptive implants, IUDs, or barrier methods.
- Remember that mothers can become pregnant while breastfeeding and should use contraceptives if they wish to avoid another pregnancy.
Frequently Asked Questions (FAQs)
Q: Will taking Plan B reduce my milk supply?
A: Studies show no significant reduction in milk supply after taking Plan B or levonorgestrel-based emergency contraception.
Q: Is it safe for my baby if I take Plan B while breastfeeding?
A: Yes, existing research indicates that Plan B passes into breast milk in tiny amounts and does not harm infants. No adverse effects were reported in studies of breastfeeding mothers who took Plan B.
Q: How soon can I breastfeed after taking Plan B?
A: You can breastfeed immediately after taking Plan B. Most guidelines state there is no need to delay nursing.
Q: Are other emergency contraceptives safe during breastfeeding?
A: Levonorgestrel pills are the preferred emergency contraception for breastfeeding mothers. Copper IUDs are also safe. Ulipristal acetate may require milk expression and discarding for 24 hours after the dose, and mifepristone-containing ECPs are not recommended.
Q: What should I do if I have side effects or concerns?
A: Reach out to your healthcare provider for support. If your milk supply temporarily drops, increase nursing or pumping frequency and ensure you stay hydrated and well-nourished.
When to Consult a Healthcare Professional
Always seek medical advice if you experience any of the following after using emergency contraception:
- Continued reduction in milk supply that doesn’t improve
- Noticeable changes in your baby’s health or behavior
- Side effects that are bothersome or persistent
- Your period is delayed more than 5 days after use
- You have difficulty choosing the right longer-term contraceptive
Alternative Contraceptive Methods for Breastfeeding Mothers
- Progestin-only pills (“mini-pill”)
- Contraceptive implants (e.g., etonogestrel)
- IUDs (copper or hormonal)
- Barrier methods (condoms, diaphragms)
Each of these methods offers different advantages. Progestin-only options are especially well-suited for breastfeeding mothers because they do not impact milk production.
Key Takeaways
- Plan B (levonorgestrel) is considered safe for breastfeeding mothers and their babies.
- Milk supply and quality are not affected by Plan B use in most cases.
- Breastfeeding can be continued without interruption after taking Plan B.
- Consult your healthcare provider for personalized advice and support.
- Explore longer-term contraceptive options for reliable ongoing pregnancy prevention.
