It is a chemically modified form.
http://www.rxlist.com/pristiq-drug.htm
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Desvenlafaxine (O -desmethylvenlafaxine) is the major active metabolite of the antidepressant venlafaxine, a medication used to treat major depressive, generalized anxiety, social anxiety and panic disorders.
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Many drug companies do this~~ when their patents run out, they use the active metabolite as a new drug.
Other examples are Claritin to Clarinex
albuterol to Xopenex
Seldane to Allegra
Because potencies change with metabolism, milligrams will look different, typically lower.
But in essence it is the same drug in the body, doing the same things. It is NOT a new entity.
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Weezie looking at petunias 8.25.2017
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