Kev siv Anavar yuav txo qis lub ntuj pituitary axis tsim nyog los tswj testosterone ntau lawm. Cov txiv neej uas siv Anavar yuav muaj kev txo qis hauv LH, FSH, SHBG thiab tag nrho thiab dawb testosterone. Feem ntau nyob rau hauv cov txiv neej uas muaj mob nkim nqaij nkos los yog HIV nkim, Anavar yog ua ke nrog testosterone.
Kev siv Anavar tau pom tias txo qis kev sib deev hormone khi globulin (SHBG). Kev txo qis hauv SHBG txo qhov nce ntxiv ntawm testosterone dawb (active) hauv lub cev.