Letrozole yog ib feem ntawm lub cim tshiab ntawm kev xaiv aromatase inhibitors thiab yog ib qho khoom siv hluavtaws benzotriazole derivative.Letrozole inhibits aromatase kom txo qis cov tshuaj estrogen, yog li tiv thaiv cov tshuaj estrogen los ntawm stimulating qog loj hlob.Nws cov haujlwm hauv vivo yog 150-250 lub sijhawm muaj zog dua li ntawm thawj tiam aromatase inhibitor Amarante.Raws li nws muaj kev xaiv heev, nws yuav tsis cuam tshuam rau glucocorticoid, mineralocorticoid thiab cov thyroid ua haujlwm;Txawm tias muaj ntau npaum li cas, nws yuav tsis muaj qhov cuam tshuam rau adrenal corticosteroid secretion, muab nws qhov kev kho mob siab.