My Neurologist has diagnosed me Transverse Myleytis on my right side head to toe. He hasn t found the reason yet. He has supscribed gabapentin 300 mg to relieve my stingness on my right side. I think gabapentin is causing me to gain weight and cause swelling in my ankles and feet. I still only eat about 1 meal a day and maybe a snack for dinner. I m a single 58 year male. 5 ft 7 in tall and weigh 198 pounds naked. I just bought a weight scale for the first time in my whole life. I believe I have gained 20 lbs in 4 months since I have been taken gabapentin. Is this true
Yes it is a known side effect. If it is troublesome then taper the dose. If neuropathic pain is significant then try tab nortriptyline. Hope my advice will help you.  Take care.  Don't forget to rate me.