depression
"Added Deplin 15mg to 150 mg dose of Wellbutrin when the Wellbutrin no longer worked as well. It did help for a few days but then I developed severe muscle weakness, stiffness and pain particularly in my neck and shoulders. Bad enough that I could not turn my head or look up or down without great discomfort. Kind of felt like I had whiplash. I did some research and found that the muscle pain can be a side effect of both medications. I have not ever had this problem on Wellbutrin alone, so I'm inclined to think the Deplin caused this. I quit taking both medications because I couldn't function with the pain and stiffness any longer and 2 days later the pain is still there but is slowly subsiding."