Do citalapram and gabapentin mix?

Yes: They are commonly taken together under a physician's supervision.

Yes: I like this combination for anxiety and depression. Be careful to keep the citalopram dose low enough to avoid agitating neurologic and cardiac symptoms. Also, Gabapentin doesn't last long and individual doses (300-800) may cause over-sedation and a loopy, "high" feeling. More frequent low doses may be better for some people.