## Emergency Contraception: Levonorgestrel as First-Line Oral Option ### Why Levonorgestrel 1.5 mg is the Most Appropriate Here **Key Point:** Levonorgestrel 1.5 mg as a single oral dose is the **first-line recommended emergency contraceptive** in India (MoHFW guidelines) and by the WHO for women presenting within 72 hours of unprotected intercourse. At 18 hours post-coitus, this patient is well within the optimal window. **High-Yield:** The question asks for the "most appropriate regimen" in the context of a healthy, young woman presenting to an emergency department — a setting where oral, non-invasive, immediately dispensable therapy is the standard of care. Levonorgestrel fulfills all these criteria. ### Why Not the Copper IUD (Option C)? **Clinical Pearl:** While the copper IUD is indeed the **most efficacious** emergency contraceptive (>99%, effective up to 5 days), it is **not the most appropriate first-line choice** in this scenario for the following reasons: 1. **Invasive procedure:** Requires trained provider, sterile setting, and pelvic examination — not routinely performed as first-line in an ED for an otherwise healthy patient. 2. **Patient context:** An unmarried woman who has not requested ongoing contraception; IUD insertion requires informed consent for a long-term device. 3. **Guideline hierarchy:** WHO and Indian national guidelines recommend oral EC (levonorgestrel) as first-line; copper IUD is reserved for patients who desire ongoing contraception or when oral EC is contraindicated/unavailable. 4. **Practical accessibility:** Levonorgestrel is OTC in India; copper IUD requires a procedure. The copper IUD is the **gold standard for efficacy**, but "most appropriate" in a clinical vignette context integrates efficacy, invasiveness, patient preference, and guideline-based practice. ### Comparison of Emergency Contraceptive Options | Agent | Timing | Efficacy | Notes | |-------|--------|----------|-------| | **Levonorgestrel 1.5 mg** | <72 hrs | 60–95% | First-line oral EC; OTC in India | | Yuzpe regimen (Option B) | <72 hrs | ~75% | Outdated; more nausea/vomiting | | Mifepristone 10 mg × 5 days (Option A) | <72 hrs | ~98% | Restricted; not standard EC regimen | | Copper IUD (Option C) | <5 days | >99% | Most efficacious; invasive; for ongoing contraception | ### Mechanism of Action **Clinical Pearl:** Levonorgestrel acts primarily by: 1. **Inhibiting or delaying ovulation** (main mechanism — especially effective before the LH surge) 2. Altering cervical mucus and endometrial receptivity (minor roles) 3. Does **NOT** interrupt an established pregnancy On day 12 of a 28-day cycle, ovulation is expected ~day 14. Levonorgestrel given at 18 hours post-coitus can effectively delay ovulation and prevent fertilization. ### Why Other Options Are Incorrect - **Option A (Mifepristone 10 mg × 5 days):** Not a standard EC regimen; mifepristone 10 mg single dose is used in some countries, but 5-day regimen is not standard and has abortifacient implications. - **Option B (Yuzpe regimen):** Older, less preferred due to higher side-effect profile (nausea, vomiting) and lower efficacy (~75%) compared to levonorgestrel. - **Option C (Copper IUD):** Most efficacious but invasive, requires procedural setup, and is not first-line for a patient not seeking ongoing contraception in an ED setting. **Mnemonic — LEMON for Levonorgestrel EC:** - **L**evonorgestrel 1.5 mg single dose - **E**ffective within 72 hours (best <24 hrs) - **M**echanism: ovulation inhibition - **O**ral, non-invasive, OTC - **N**o absolute contraindications in healthy women **Warning:** Emergency contraception does NOT protect against STIs. Barrier contraception counseling is essential. [cite: Park's Textbook of Preventive & Social Medicine, 26e, Ch 9; WHO Emergency Contraception Fact Sheet 2021; MoHFW India Family Planning Guidelines]
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