The mechanism of action of copper IUDs (Cu-T) is primarily by:

• A Preventing ovulation
• B Thickening cervical mucus to block sperm entry
• C Inducing endometrial atrophy
• D Spermicidal and anti-implantation effect due to copper ions ✓

Explanation

Copper IUDs work primarily through copper ions creating a sterile inflammatory reaction in the endometrium that is spermicidal and also prevents implantation. They do not suppress ovulation (that is hormonal methods). Thickening of cervical mucus is the mechanism of progesterone-only methods. Endocrine atrophy is not the primary mechanism of copper devices.

Reference: Contraceptive Technology, 21st ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.