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Anastrozole is a potent third-generation nonsteroidal aromatase blocker.


Anastrozole is an aromatase inhibitor (AI) drug designed to decrease circulating estrogen in blood plasma and stimulate the production of endogenous testosterone and gonadotropic hormones.

Aromatase inhibitors belong to an even broader class of medications known as antiestrogens.

Anastrozole is used as adjunctive treatment for breast cancer. It is the most popular aromatase inhibitor among bodybuilders who use anabolic steroids to control estrogen.

Helps to get rid of estrogenic side effects: manifestation of gynecomastia, water retention and bloating, hypertension (due to water retention, increased estrogen).

Studies have shown that the use of anastrozole by men was effective enough to reduce plasma estrogen levels by 50%, only at a dose of 0.5-1 mg per day.


Anastrozole and letrozole are classified as non-steroidal, non-suicidal aromatase inhibitors that compete with the substrate for binding to the enzyme's active sites.

Bodybuilders and athletes who take anabolic steroids generally prefer aromatase inhibitors like anastrozole for their ability to reverse rising estrogen levels at the root cause: aromatase.

Via the aromatase enzyme, supraphysiological levels of aromatized androgens (such as testosterone, danabol, boldenone, etc.) cannot be converted to estrogen, thus eliminating any potential risk of estrogen-related side effects.


Athletes use this type of medication during an anabolic androgenic steroid cycle to:

  • Warnings for gynecomastia,
  • Increase the amount of anabolic hormones in the blood,
  • impact upgrades,
  • Normalization of blood pressure.


An increase in the dose of the drug can excessively reduce estrogen levels and provoke the following undesirable manifestations:

  • slower muscle development
  • joint pain,
  • bone fragility,
  • Increased cholesterol level,
  • Depression.


  • Intolerance to the components of the drug,
  • Allergy,
  • Heart failure,
  • liver or kidney failure,
  • Pregnancy and lactation,
  • Combination with drugs containing estrogen or tamoxifen,
  • Osteoporosis.


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