"This is a tricky question because you are talking about extended release Xanax. According to this chart (http://en.wikipedia.org/wiki/List_of_ben… 40mg of oxazepam would be equal to 1mg of instant release alprazolam. However, since the Xanax XR works slowly and over time, it might feel like a bit less, and thus a lower dose of oxazepam might feel like it has the same effect. After taking a look at that chart, it seems that Xanax peaks higher and lasts longer than Oxazepam overall. For me, Xanax begins working within 15 minutes, usually always before that. I'm not sure about oxazepam though. Hope this helped, and best of luck!"
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