Which of the following contraceptives has the LOWEST theoretical failure rate (Pearl Index ≤0.1 per 100 woman-years)?
- A Combined oral contraceptive pill
- B Cu-T 380A (copper IUD)
- C Etonogestrel implant (Implanon) ✓
- D Male condom
Correct answer: C. Etonogestrel implant (Implanon)
Explanation
The etonogestrel single-rod subdermal implant (Implanon/Nexplanon) has a theoretical failure rate of 0.05 per 100 woman-years (Pearl Index), making it one of the most effective reversible contraceptives. Combined OCP failure rate is 0.3/100 WY (perfect use). Cu-T 380A failure rate is 0.6–0.8/100 WY. Male condom failure rate is 2/100 WY (perfect use). The implant's superiority comes from eliminating user compliance issues — it releases etonogestrel continuously for 3 years without requiring any action by the user.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.