Nortriptyline
 

My neurologist took me off Nortriptyline saying that it has tendency to make one hungry and probably caused my weight gain. Curses Red Baron I struggled to lose 20 lbs now it came back. Anyone else had this problem

Unfortunately--
 

--many of the anti-epileptics used for neuropathy, and a number of the other meds, including some of the anti-depressants, tend to cause carb-craving and appetite increases, so weight gain, both due to that and in the case of some of the meds fluid retention as well, are fairly common side effects.

Among the anti-epileptics, a notable exception to this pattern is Topomax, which more people have reported wight loss with; the why's of that are not known, though.

Amitriptyline and nortriptyline (its active metabolite) can raise blood sugar levels in some people. This is perhaps one reason that weight gain
results.

one study:
http://www.ncbi.nlm.nih.gov/pubmed/9178335