Emergency contraception with ulipristal acetate (UPA, 30 mg single dose) is effective for how long after unprotected intercourse?
- A Up to 24 hours
- B Up to 72 hours
- C Up to 120 hours (5 days) ✓
- D Up to 7 days
Correct answer: C. Up to 120 hours (5 days)
Explanation
Ulipristal acetate (UPA) is a selective progesterone receptor modulator approved for emergency contraception up to 120 hours (5 days) after unprotected intercourse, and has greater efficacy than levonorgestrel at 72-120 hours. Levonorgestrel (Plan B, 1.5 mg) is effective up to 72 hours. The copper IUD is the most effective emergency contraceptive, usable up to 120 hours. UPA acts primarily by inhibiting or delaying ovulation.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
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Written and medically reviewed by the StethoPrep medical team.