Plan B vs. ella vs. Copper IUD: Emergency Contraception Compared — Privately Ask Clinical Guide
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Emergency Contraception Medically Reviewed

Plan B vs. ella vs. Copper IUD: Emergency Contraception Compared

A clinical comparison of levonorgestrel, ulipristal acetate, and IUD insertion timelines, weight limits, and availability.

By Privately Ask Contraceptive Health Taskforce • Updated September 2026 • 7 min read

Clinical Review Standard

Reviewed by Dr. Maya Patel, MD, Reproductive Endocrinologist. Grounded in consensus guidelines from CDC, WHO, NHS, and ACOG.

Key Clinical Takeaways
  • Plan B (Levonorgestrel) is available over-the-counter without age restrictions or ID; effective up to 72 hours (3 days).
  • ella (Ulipristal acetate) requires a prescription; it maintains high effectiveness across 120 hours (5 days) and works closer to ovulation than Plan B.
  • The Copper IUD or 52mg Levonorgestrel IUD inserted within 5 days is >99.9% effective and serves as long-term birth control for up to 10–12 years.
  • Body weight matters: Plan B has reduced efficacy over 165 lbs; ella works up to 195 lbs; IUDs have zero weight limitations.

1. The Three Primary Methods Compared

When unprotected intercourse occurs, choosing the optimal method depends on hours elapsed, body weight, and accessibility.

Plan B & Generics: Over-the-counter. Best taken within 0–24 hours, valid up to 72 hours. Ideal for weights under 165 lbs.
ella (Ulipristal Acetate): Prescription required (available via fast telehealth). Effective up to 120 hours (Day 5). Effective up to 195 lbs. Note: Cannot be taken concurrently with regular hormonal pills (requires a 5-day pause).
Emergency IUD Insertion: Highest efficacy (>99.9%). Must be inserted by a clinician within 5 days. Works at any weight.

Myths vs. Clinical Facts

Myth Taking two Plan B pills works as well as ella for higher body weights.
Fact Studies confirm that doubling the dose of levonorgestrel does not significantly improve efficacy in individuals with higher BMIs.

Evidence: ACOG recommends ella or an IUD for individuals weighing over 165 lbs.

Frequently Asked Questions

Can I get ella without going to a doctor's office in person?

Yes. Many telehealth services (Wisp, Nurx, Planned Parenthood Direct) offer same-day digital prescriptions sent directly to your local pharmacy.

When to Consult a Healthcare Professional

  • • More than 72 hours have elapsed since unprotected sex — ask a clinician for ella or an emergency IUD insertion.
  • • Unexplained pelvic pain 3–4 weeks later.
Authoritative Medical Citations & Sources
  • ACOG — Practice Bulletin No. 152: Emergency Contraception
  • CDC — Emergency Contraception Guidance
  • Planned Parenthood — Which Emergency Contraception Is Best for You?
  • European Medicines Agency (EMA) — Ulipristal Acetate Assessment