Effect of ethanol administration to male cynomolgus monkeys on serum levels of GABAergic neuroactive steroids. Ethanol (1.5 g/kg, 30% w/v in tap water) was administered intragastrically and blood samples were collected before, 60 and 120 minutes from ethanol administration. Levels are expressed as pg/ml and are average ± SEM of twelve subjects. 3α,5β-androstandiol was detected only in 9/12 subjects before ethanol administration and in 10/12 subjetcs after ethanol administration. 3α,5β-THDOC, 3α,5β-androsterone and 3α,5β-androstandiol were undetectable (n.d.).