Do you recommend using anastrazole in men developing gynecomastia while on testosterone replacement treatment for hypogonadism depending on pre-treatment estradiol level?  

There is no role for aromatase inhibitors (e.g., anastrozole) for the prevention of gynecomastia. A randomized trial of anastrozole for the treatment of gynecomastia demonstrated no benefit compared to placebo.There is no reason to administer prophylactic therapy prior to the initiation of testoster...