Emergency Pills (i-pill / Postinor): What They Do, What They Don't Do, and Misuse Risks

🇬🇧 English Version

Emergency Pills (i-pill / Postinor): What They Do, What They Don't Do, and Misuse Risks

“Key Takeaway: Over-the-counter availability of single-dose Levonorgestrel (1.5 mg) emergency contraceptive pills (ECPs) in South Asia has catalyzed widespread clinical misuse as pseudo-maintenance contraception. Pharmacologically, ECPs function exclusively by blunting the pre-ovulatory luteinizing hormone (LH) surge, delaying follicular rupture for 5–7 days. ECPs possess zero abortifacient properties once blastocyst implantation has occurred and provide zero retrograde or forward coital coverage. Serial, recurrent administration induces acute endometrial dyssynchrony and severe hypothalamic-pituitary-ovarian (HPO) axis deregulation.

Pharmacodynamics and Endocrine Cascade of Levonorgestrel ECP

Recurrent Misuse vs. Maintenance Contraception Efficacy

subgraph Chronic Maintenance Contraception M1["Steady-State Low-Dose Daily Combined OCPs / LARC"] M2["Consistent >99% Contraceptive Protection with Predictable Menstrual Bleeding"] end

E1 --> E2 E2 -.->|Clinical Transition| M1 --> M2

1. The Critical Non-Abortifacient Distinction

Unlike mifepristone-misoprostol medical termination regimens, levonorgestrel does not alter endometrial decidual integrity post-implantation, nor does it disrupt gestational sac development.

2. Body Mass Index (BMI) Efficacy Thresholds

Clinical trials confirm that the contraceptive efficacy of standard levonorgestrel degrades when patient BMI exceeds 25–30 kg/m²; in elevated BMI patients, double-dose LNG, Ulipristal acetate (30 mg), or emergency Copper IUD insertion represents standard clinical practice.

Emergency vs. Maintenance Contraceptive Profile

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