Oxandrolone in the treatment of HIV-associated weight loss in men: a randomized, double-blind, placebo-controlled study. - PubMed - NCBI
The study is not freely available, but I can quote from it:
In men taking 20 mg Anavar daily for 12 weeks, testosterone decreased to 54% of the baseline level and liver enzymes increased by ca. 10%.
In men taking 40 mg Anavar daily for 12 weeks, testosterone decreased to 55% of the baseline level and liver enzymes increased by ca. 30-40%.
In men taking 80 mg Anavar daily for 12 weeks, testosterone decreased to 33% of the baseline level and liver enzymes increased by ca. 51% (AST)-94% (ALT).
Such a low decrease of testosterone is quite impressive. To be honest, the baseline levels were already quite low, around 300 ng/dl, but if you still have over 100 ng/dl after 12 weeks of high Anavar doses, that's not a bad start for PCT.
The increase of liver enzymes at high doses was marked, but most of the subjects would remain within the normal limits.
Naturally, these are averages and the range of values was wide. Perhaps, I was just one of those unlucky men, who reacted to Anavar by too deep testosterone suppression, because my values at the end of the cycle ranged only between 10-50 ng/dl. On the other hand, my liver was "Anavar-resistant", because I have never had liver enzymes over the uppermost limit, even at 70-80 mg/day for 6 weeks.