Paper II
2015 September (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Clomiphene citrate.

Q53 marksShort Notes

Answer

Clomiphene citrate is a selective oestrogen receptor modulator used as an ovulation-inducing agent.

Mechanism of action

  • Competitively blocks oestrogen receptors in the hypothalamus, interfering with the negative feedback of endogenous oestrogen
  • This “tricks” the hypothalamus into perceiving low oestrogen levels, leading to increased GnRH pulsatility and consequently increased FSH/LH secretion from the pituitary, which stimulates follicular development and ovulation

Uses

  • First-line treatment for anovulatory infertility (e.g., in PCOS)

Adverse effects

  • Hot flushes
  • Ovarian hyperstimulation syndrome
  • Multiple pregnancy (increased risk of twins)
  • Visual disturbances
  • Abdominal discomfort/ovarian enlargement

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