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Old 10-20-2008, 08:15 AM #2
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mrsD mrsD is offline
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mrsD mrsD is offline
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Join Date: Aug 2006
Location: Great Lakes
Posts: 33,508
15 yr Member
Lightbulb this is the same as Effexor.

It is a chemically modified form.
http://www.rxlist.com/pristiq-drug.htm
Quote:
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.

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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