What is anastrozole?
Anastrozole is an aromatase inhibitor medication that blocks the enzyme responsible for converting testosterone to estrogen, commonly prescribed during TRT to manage estrogen levels.
Anastrozole belongs to a class of medications called aromatase inhibitors. It works by blocking aromatase, the enzyme that converts testosterone into estrogen in the body. During testosterone replacement therapy, testosterone administration can lead to elevated estrogen levels as the excess hormone undergoes conversion. This can cause unwanted side effects like gynecomastia (breast tissue development), fluid retention, and mood changes.
Men on TRT may be prescribed anastrozole to manage estrogen conversion and maintain appropriate hormone balance. The medication is typically taken orally. Dosing varies depending on the individual's testosterone dose, baseline estrogen levels, and clinical response. Common doses range from 0.5 mg to 1 mg per day or every other day, though this should always be determined by the prescribing provider.
Monitoring is essential when taking anastrozole. Providers typically order estrogen (specifically estradiol) blood tests to confirm the drug is achieving target levels without causing over-suppression. Estrogen that drops too low can create its own problems, including joint pain, reduced libido, and mood disturbance. Regular lab work helps maintain the narrow window where estrogen is controlled but not depleted. Not all men on TRT require an aromatase inhibitor; many maintain healthy estrogen naturally. The decision to add anastrozole depends on individual lab results and symptoms.