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Sripada et al. reported that oral pregnenolone is preferentially metabolized into the neurosteroid allopregnanolone rather than into other steroids such as DHEA or cortisol .  In further research by their group, a single 400 mg dose of oral pregnenolone at 3 hours post-administration was found to result in a 3-fold elevation in serum levels of pregnenolone and a 7-fold increase in allopregnanolone levels.  Pregnanolone levels increased by approximately 60% while DHEA levels decreased non-significantly by approximately 5% and cortisol levels were not affected.  Another study found that allopregnanolone levels were increased by 3-fold at 2 hours post-administration following a single 400 mg oral dose of pregnenolone. 
In a comparative study on 189 patients with adjustment disorder with anxiety, one group of patients took 150mg of Stresam daily for 28 days, while the other group took 2mg of Lorazepam (Ativan). The treatment efficiency was similar for both drugs regarding mean HAM-A score. However, more people from etifoxine group responded to the treatment by the day 28 (72% and 56%). The first group also experienced fewer side effects compared to lorazepam group and fewer cases of rebound anxiety. Similar results were obtained in the comparative study of Stresam with Alprazolam (Xanax).