Switching from Effexor to Welbutrin. 150 mgs Wlbtrn 2 X day, 75mg Efexor X once/day at night. I have been weaning off the Effexor and am ready to go down again - 37.5 mg. will be my next step. Been on both drugs about 2 wks. Yesterday I started having side effects to the Wellbutrin. Dry mouth, ringing in ears, stomach ache, agitation and tensed up. The agitation is the one that really gets to me.
1. Why would it take so long for these to appear?
2. If the side effects are going to wear off, when should I expect that to start?

Thank you very much
pmw