I've read Effexor XR and pristiq (desvenlafaxine) are actually different and pristiq (desvenlafaxine) may not work as well. Have been on Effexor gained a lot of weight. Depressed again?

Similar. Similar efficacy. Maybe more potential side effects with venlafaxine. Wt gain possible but not common. May be depression but should think about exercise as a part of your depression treatment.
Effexor vs Pristiq (desvenlafaxine) Interesting to find out that drugs sold in Australia have same names as sold here in States. So check out Effexor (venlafaxine) at http://www.drugs.com/effexor.html & Pristiq (desvenlafaxine) at http://www.drugs.com/pristiq.html. Previously drugs came in identical right & left mirror images, 50% of each. Now we can isolate functional half eg desvenlafaxine w/less potential side effects.

Related Questions

If I'm allergic to Effexor XR (itchy/can't breathe well) can I be put on pristiq (desvenlafaxine)?

Allergy to Effexor (venlafaxine) It is possible but not entirely that you will be allergic to Pristiq (desvenlafaxine) if you are allergic to Effexor (venlafaxine) because the molecules are similar. Although you may be allergic to other compounds in the medication (excipients or extended release formula) it is possible to try and see if you develop the same symptoms. I would recommend that you add some antihistamine (benadryl). Read more...

If I'm allergic to Effexor XR (itchy/can't breathe well) can I be put on pristiq (desvenlafaxine)? Or are there same ingredients? I've had bad tolerance with ssri's

Allergy to Effexor (venlafaxine) It is possible but not entirely that you will be allergic to Pristiq (desvenlafaxine) if you are allergic to Effexor (venlafaxine) because the molecules are similar. Although you may be allergic to other compounds in the medication (excipients or extended release formula) it is possible to try and see if you develop the same symptoms. I would recommend that you add some antihistamine (benadryl). Read more...