Letrozole, like any other aromatase inhibitor, increases testosterone. The increase is usually not "felt" by the men who use it as monotherapy.
You were taking a high dose, by the way!
Eur J Endocrinol. 2008 May;158(5):741-7. doi: 10.1530/EJE-07-0663.
Letrozole once a week normalizes serum testosterone in obesity-related male hypogonadism.Loves S1, Ruinemans-Koerts J, de Boer H.
[h=3]Author information[/b]
[h=3]Abstract[/b][h=4]OBJECTIVE:[/b]Isolated hypogonadotropic hypogonadism (IHH) is frequently observed in severely obese men, probably as a result of increased estradiol (E(2)) production and E(2)-mediated negative feedback on pituitary LH secretion. Aromatase inhibitors can reverse this process. This study evaluates whether letrozole once a week can normalize serum testosterone in severely obese men and maintain its long term effect.
[h=4]DESIGN:[/b]Open, uncontrolled 6-month pilot study in 12 severely obese men (body mass index>35.0 kg/m(2)) with obesity-related IHH and free testosterone levels <225 pmol/l, treated with 2.5 mg letrozole once a week for 6 months.
[h=4]RESULTS:[/b]Six weeks of treatment reduced total E(2) from 123+/-11 to 58+/-7 pmol/l (P<0.001, mean+/-s.e.m.), and increased serum LH from 4.4+/-0.6 to 11.1+/-1.5 U/l (P<0.001). Total testosterone rose from 5.9+/-0.5 to 19.6+/-1.4 nmol/l (P<0.001), and free testosterone from 163+/-13 to 604+/-50 pmol/l (P<0.001). Total testosterone rose to within the normal range in all subjects, whereas free testosterone rose to supraphysiological levels in 7 out of 12 men. The testosterone and E(2) levels were stable throughout the week and during the 6-month treatment period.
[h=4]CONCLUSION:[/b]Letrozole 2.5 mg once a week produced a sustained normalization of serum total testosterone in obese men with IHH. However, free testosterone frequently rose to supraphysiological levels. Therefore, a starting dose <2.5 mg once a week is recommended.