A 32-year-old woman from Mumbai attends the family planning clinic requesting emergency contraception. She reports unprotected intercourse 36 hours ago. She is breastfeeding her 2-month-old infant and has no significant past medical history. Menarche was at age 12, and she has regular cycles. She is afebrile, BP 120/78 mmHg, and general examination is unremarkable. What is the most appropriate emergency contraceptive regimen for this patient?

Explanation

## Clinical Analysis This patient is **breastfeeding a 2-month-old infant** and presents within 36 hours of unprotected intercourse. The choice of emergency contraceptive must balance efficacy, timing, and lactation safety. ### Why Copper IUD is the Best Choice **Key Point:** The copper intrauterine device is the most effective emergency contraceptive (>99% efficacy) and is the only method that can be inserted up to 5 days after unprotected intercourse. It is completely safe during breastfeeding and does not enter breast milk. **High-Yield:** Cu-IUD is the **gold standard** emergency contraceptive because: 1. **Highest efficacy:** >99% (compared to 60–90% for hormonal methods) 2. **Extended window:** Can be inserted up to 5 days post-intercourse (this patient is at 36 hours—well within the window) 3. **Breastfeeding-safe:** No hormonal absorption into breast milk; no impact on lactation 4. **Long-acting reversible contraception:** Provides 10 years of contraceptive cover after emergency use 5. **No drug interactions:** Works independently of any systemic factors ### Mechanism of Cu-IUD as Emergency Contraceptive Copper ions are spermicidal and impair sperm motility and fertilization capacity. The IUD also induces a sterile inflammatory response in the endometrium, preventing implantation. These mechanisms work even if ovulation has already occurred, making it effective throughout the cycle. ### Comparison of Emergency Contraceptive Options in Breastfeeding | Method | Efficacy | Timing Window | Breastfeeding Safety | Notes | |--------|----------|----------------|----------------------|-------| | **Cu-IUD** | >99% | Up to 5 days | **Safe** — no hormones | **Gold standard**; most effective | | **Levonorgestrel** | 60–90% | Up to 72 hours | **Caution** — small amount in milk; WHO says acceptable but not ideal | Less effective; narrower window | | **Mifepristone** | 85–95% | Up to 72 hours | **Contraindicated** — abortifacient; risk of fetal exposure | Not recommended in lactation | | **Ulipristal acetate** | 85–98% | Up to 120 hours | **Caution** — limited data; WHO says use with caution | Newer; less data in lactation | **Clinical Pearl:** Levonorgestrel is often used as a first-line emergency contraceptive in non-lactating women, but in breastfeeding mothers, the small amount excreted in breast milk and the superior efficacy of Cu-IUD make the IUD the preferred choice. Mifepristone is an abortifacient and is contraindicated in lactation due to risk of fetal exposure. **Warning:** Do not confuse emergency contraception with abortion. Cu-IUD works by preventing fertilization and implantation; it is not an abortifacient and does not disrupt an established pregnancy. ### Insertion Procedure Considerations - Cu-IUD insertion is a quick outpatient procedure (5–10 minutes) - Requires confirmation of non-pregnancy (clinical assessment or urine βhCG if >5 days since intercourse) - No contraindications in this patient: no signs of infection, regular cycles, multiparous, no copper allergy history - Can be inserted immediately; no need to wait for next menses [cite:WHO Emergency Contraception Guidelines 2023; KD Tripathi 8e Ch 64; Harrison 21e Ch 297]