Question

A 35-year-old woman is initiated on combined oral contraceptive pill containing ethinylestradiol and levonorgestrel. What is the primary pharmacological mechanism by which it prevents pregnancy?

Accepted Answer

Inhibition of gonadotropin release, preventing ovulation

Answer

Enhancement of uterine contractility

Answer

Thickening of the endometrium

Answer

Increased cervical mucus dryness

Answer

Direct ovicidal effect

Practice question

A 35-year-old woman is initiated on combined oral contraceptive pill containing ethinylestradiol and levonorgestrel. What is the primary pharmacological mechanism by which it prevents pregnancy?