A 28-year-old woman presents to the clinic 96 hours after unprotected intercourse. She is breastfeeding her 6-month-old infant and is concerned about emergency contraception. She has no medical contraindications. What is the most appropriate next step in management?

Explanation

## Emergency Contraception in Lactating Women: Timing and Drug Selection **Key Point:** At 96 hours post-intercourse, levonorgestrel is no longer effective (window closes at 72 hours). Ulipristal acetate (ella), a selective progesterone receptor modulator, extends the window to 120 hours and is safe in breastfeeding. ### Timeline Analysis **This patient:** 96 hours (4 days) post-intercourse - **Levonorgestrel window:** ≤72 hours — **EXPIRED** - **Ulipristal acetate window:** ≤120 hours — **STILL VALID** - **Cu-IUD window:** ≤5 days — **STILL VALID** ### Emergency Contraception Options in Lactation | Method | Timing | Lactation Safety | Efficacy | Mechanism | |--------|--------|------------------|----------|----------| | Levonorgestrel | ≤72 hours | Safe (minimal transfer) | 60–40% | Ovulation inhibition | | Ulipristal acetate | ≤120 hours | Safe (minimal transfer) | 65–45% | Progesterone receptor modulation | | Cu-IUD | ≤5 days | Safe (no systemic absorption) | >99% | Spermicide + inflammation | | Mifepristone | ≤72 hours | Contraindicated | ~95% | Progesterone antagonist | **High-Yield:** Neither levonorgestrel nor ulipristal acetate is contraindicated in breastfeeding. Both have minimal transfer into breast milk and do not affect milk supply or infant safety. Breastfeeding is **NOT** a contraindication to emergency contraception. ### Why Ulipristal Acetate (Option B) Is Correct 1. **Extended window:** 120 hours vs. levonorgestrel's 72 hours — this patient is at 96 hours 2. **Higher efficacy in days 3–5:** Ulipristal acetate is more effective than levonorgestrel when given 3–5 days post-intercourse 3. **Safe in lactation:** Minimal breast milk transfer; no impact on infant 4. **Mechanism:** Selective progesterone receptor modulator — more potent ovulation inhibition than levonorgestrel **Clinical Pearl:** Ulipristal acetate is a prescription medication and is more expensive than levonorgestrel, but it is the evidence-based choice when presenting 3–5 days post-intercourse, particularly in resource-rich settings. ### Why Not the Other Options? **Levonorgestrel (Option A):** While safe in breastfeeding, it is **no longer effective** at 96 hours. The 72-hour window has closed. Administering it now would provide false reassurance without actual contraceptive benefit. **Contraindication in breastfeeding (Option C):** **Incorrect.** Breastfeeding is NOT a contraindication to emergency contraception. Both levonorgestrel and ulipristal acetate are safe in lactation. This is a common misconception among providers and patients. **Cu-IUD as only safe option (Option D):** While Cu-IUD is safe and highly effective in lactating women, it is not the "only" safe option. Ulipristal acetate is also safe, non-invasive, and more appropriate for this patient who presents within the 120-hour window. Cu-IUD is preferred if the patient has contraindications to hormonal methods or presents beyond 120 hours.