Suicidal aromatase inhibitor — harder to crash E2 than Arimidex/Letro.
Typical dose range: 12.5–25 mg
Frequency: EOD or daily
Route: Oral
Half-life: ~24 h
Evidence level: Clinical
Permanently inactivates aromatase enzyme. More forgiving than Arimidex; some use it through PCT for the test rebound.