## Emergency Contraception at 72 Hours **Copper-T (Copper Intrauterine Device)** is the most effective emergency contraceptive method available, with efficacy >99% when inserted within 5 days of unprotected intercourse. It works by creating an inflammatory response that prevents sperm-ovum union and implantation. ### Comparison of Methods: | Method | Efficacy | Time Window | Mechanism | |--------|----------|-------------|----------| | **Copper-T** | >99% | Up to 5 days | Prevents fertilization & implantation | | Levonorgestrel | 60–90% | Up to 72 hours | Delays/inhibits ovulation | | Mifepristone | 85–90% | Up to 72 hours | Progesterone antagonist | | Yuzpe regimen | 75% | Up to 72 hours | Delays ovulation | **Key Point:** Copper-T is the **gold standard** emergency contraceptive because: - Highest efficacy (>99%) - Effective up to **5 days** post-intercourse (not just 72 hours) - Can be left in situ as ongoing contraception (10–12 years) - No hormonal side effects - Can be used in women with contraindications to hormonal methods **Clinical Pearl:** At 72 hours, while levonorgestrel is still within its window, copper-T insertion is superior because the patient is still well within the 5-day window, and efficacy is significantly higher. **High-Yield:** WHO and Indian guidelines (FOGSI) recommend copper-T as first-line emergency contraception when available and acceptable to the patient.
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