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Steroidal aromatase inhibitor

Exemestane

Brand names: Aromasin

Adult dose

Dose: 25 mg PO OD with food
Route: PO
Frequency: OD

Clinical pearls

  • Postmenopausal ER+ early/advanced breast cancer
  • Co-prescribe vitamin D and calcium; consider DEXA at baseline + 2-yearly

Contraindications

  • Premenopausal women
  • Pregnancy/breastfeeding

Side effects

  • Hot flushes
  • Arthralgia
  • Osteoporosis/fractures
  • Fatigue
  • Hepatic dysfunction

Interactions

  • CYP3A4 inducers (rifampicin, phenytoin) reduce levels
  • Oestrogen-containing products (antagonism)

Monitoring

  • Bone density
  • Lipids
  • LFTs

Reference: BNF; NICE TA112; SmPC; https://bnf.nice.org.uk/drugs/exemestane/. Verify against your local formulary and the latest BNF before prescribing.

Related

Curated clinical cross-links plus same-class fallbacks.