Anastrozole



Anastrozole
Systematic (IUPAC) name
2-[3-(1-cyano-1-methyl-ethyl)- 5-(1H-1,2,4-triazol-1-ylmethyl)phenyl]- 2-methyl- propanenitrile
Identifiers
CAS number 120511-73-1
ATC code L02BG03
PubChem 2187
DrugBank APRD00016
Chemical data
N5 
Mol. mass 293.366 g/mol
Pharmacokinetic data
Bioavailability 83-85%
Protein binding 40%
Metabolism 85% hepatic
Half life 72 hours
Excretion 11% renal
Therapeutic considerations
Pregnancy cat.

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Legal status

Rx only (U.S.)

Routes oral

Anastrozole (estrogens that the body makes.

Anastrozole belongs in the class of drugs known as androgens (produced by women in the adrenal glands) to estrogens.

The ATAC (Arimidex, estrogen receptor positive.

Usage for men

While officially indicated for women, this drug has proven effective in the off-label use of reducing estrogens (in particular and more importantly, estradiol) in men. Excess estradiol in men can cause benign prostatic hyperplasia, gynecomastia, and symptoms of hypogonadism. Some athletes and body builders will also use anastrozole as a part of their steroid cycle to reduce and prevent symptoms of excess estrogens; in particular, gynecomastia and water retention.

Study data currently suggests that dosages of 0.5mg to 1mg a day reduce serum estradiol by about 50% in men, which differs from the typical reduction in postmenopausal women. However the reduction may be different for men with grossly elevated estradiol (clinical data is currently lacking).

Usage for children

This drug is frequently used in the treatment of growth disorder affected children to stop or slow the onset of puberty. The treatment of the growth disorder is through hormones which may trigger the early onset of puberty (precocious puberty). At the onset of puberty the bone growth plates begin to close. This can occur in children as young as 5 years old so for children severely behind in growth, the opportunity for increased growth is diminished. Arimidex is shown to slow or stop this process.

References

  1. ^ Howell A, Cuzick J, Baum M, et al (2005). "Results of the ATAC (Arimidex, Tamoxifen, Alone or in Combination) trial after completion of 5 years' adjuvant treatment for breast cancer". Lancet 365 (9453): 60-2. doi:10.1016/S0140-6736(04)17666-6. PMID 15639680.


 
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