A member asked:

New refill of effexor (venlafaxine) is xr; old bottle was not xr. same dose (75mg) can this increase anxiety/side effects temporarily?

A doctor has provided 1 answer
Dr. William Holmes answered

Specializes in Child Psychiatry

Possibly: A switch from regular to XR can make a difference in terms of benefit and possible adverse effects. Talk with your pharmacy and/or physician to get this straightened out. Plenty of people do fine with this kind of change, but since you are noticing a change, you need to get it checked out.

Answered 8/3/2014

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