Correct Answer: A. Danazol
Danazol is a synthetic androgen and is NOT a post-coital (emergency) contraceptive. While danazol has been studied for various gynecological conditions (endometriosis, fibrocystic breast disease), it has no role in emergency contraception. The question tests knowledge of the four main post-coital contraceptive methods recognized in Indian guidelines and international practice: (1) high-dose combined oral contraceptives (Yuzpe regimen), (2) levonorgestrel-only pills (Plan B), (3) mifepristone (RU486), and (4) copper-bearing IUDs (Cu-T). Danazol's mechanism—androgenic suppression of ovulation and endometrial atrophy—is irrelevant to the acute post-coital window. It requires weeks of administration to be effective and is contraindicated in pregnancy, making it unsuitable for emergency use. The discriminating fact is that danazol is a long-acting hormonal agent for chronic conditions, not an acute post-coital intervention.
Why the other options are wrong
B. Combined high dose estrogen–progestin pills — This is the Yuzpe regimen—the gold standard post-coital contraceptive in India before levonorgestrel became widely available. High-dose combined pills (e.g., 100 µg ethinyl estradiol + 500 µg norgestrel per dose, given twice 12 hours apart) work by disrupting ovulation, altering cervical mucus, and preventing implantation. Efficacy is ~75% if given within 72 hours. This is a proven, guideline-recommended emergency contraceptive method. C. RU486 — Mifepristone (RU486) is a progesterone antagonist and is a post-coital contraceptive when used within 72 hours of unprotected intercourse. It prevents implantation by blocking progesterone action on the endometrium. Although not widely available in India due to regulatory restrictions on medical abortion, it is recognized as an emergency contraceptive in international guidelines and is a valid post-coital method. D. CuT200 — Copper-bearing IUDs (Cu-T 200, Cu-T 380A) are highly effective post-coital contraceptives when inserted within 5 days of unprotected intercourse. They work via copper-induced spermicidal and inflammatory effects on the endometrium, preventing fertilization and implantation. Cu-T 200 is widely available in India and is the most effective emergency contraceptive method (>99% efficacy), recommended by Indian guidelines.
High-Yield Facts
- Yuzpe regimen (high-dose combined pills) must be given within 72 hours of unprotected intercourse; efficacy ~75%.
- Copper IUD insertion within 5 days post-coitus is the most effective emergency contraceptive (>99%); Cu-T 200 is standard in India.
- Levonorgestrel (Plan B, I-Pill) is a progestin-only post-coital pill; more effective and fewer side effects than Yuzpe regimen.
- Mifepristone (RU486) blocks progesterone; used as post-coital contraceptive within 72 hours in countries where available.
- Danazol is an androgen used for endometriosis and fibrocystic breast disease—no role in emergency contraception.
Mnemonics
POST-COITAL CONTRACEPTIVES (YUCM) Yuzpe (high-dose combined pills), Uterine (Cu-IUD), Chemical (mifepristone/RU486), Missed—Danazol is not one. Use this to quickly eliminate danazol from emergency contraceptive options. TIME WINDOWS FOR EMERGENCY CONTRACEPTION Pills = 72 hours (Yuzpe, levonorgestrel, mifepristone); IUD = 5 days (Cu-T). Danazol has no time window because it is not an emergency method.
NBE Trap
NBE pairs danazol with other hormonal contraceptives to trap students who confuse its hormonal nature with emergency contraceptive action. The trap is assuming "any hormone that affects the menstrual cycle = emergency contraceptive," when in fact danazol requires chronic dosing and has no acute post-coital mechanism.
Clinical Pearl
In Indian clinical practice, when a woman presents within 72 hours of unprotected intercourse, the first-line choice is levonorgestrel (I-Pill, available OTC) or Yuzpe regimen if levonorgestrel is unavailable. If she presents within 5 days, copper IUD insertion (Cu-T 200) is superior and can be done at any primary health center. Danazol has no place in this acute scenario and would delay appropriate emergency contraception.
_Reference: DC Dutta's Textbook of Obstetrics (8th ed.), Ch. 24 (Contraception); IAP Guidelines on Emergency Contraception; Harrison Ch. 307_