What are the side effects of gabapentin?

I gained 30 pounds in 6 @600mg months....no change in diet. I did cold turkey and no withdraw. Only learned after about weaning off it. I would not recommend doing cold turkey. Ten years later I tried Cymbalta and this worked for me.(60 mg)

You described to a T some of the things I have experienced using gabapentin 600 mg three times a day. Thank you for putting it into words. I couldn't figure out how to explain it to anyone. All 3 symptoms I experience. Quite embarrassing to be involved in explaining something and my mouth says something else than what I am trying to say.

At 68 I had major spine surgery in 2-2020. I had been on Oxycodone through pain management for a couple years as my back pain worsened. I was given Gabapentin after the surgery along with more Oxycodone. After reading about Gabapentin I didn't take it. I've never had any problems or allergies from any medications. Gabapentin scared me. At this stage of my declining health, mostly arthritis in all my joints, I've learned to manage the Oxycodone. I need a shoulder and knee replacement now, shots don't help. Had a hip replacement three years ago. I'm getting more sedimentary because my back and knee pain keep getting worse. Last year I started using cannibis edibles in the evening which has greatly helped my sleeping. My point here is these drugs may have a cloud over them, but taken in small amounts until one discovers the dosage that works best for you, there may be help there. Is my memory getting worse, yes. Why? Don't know.

I've heard Parkinson's, alzheimer, memory loss, no thank you.

@mrmacabre I have been noticed from many people has put there stories about living with Gabapentin tablets pain killers. I have been using the Gabapentin as well since after the disease Bird Flu 2009.
I think in 2011 my GP sent me to Private Hospital in Dublin for my feet were in pain.
The Doctor do a diagnosed and having told I have Diabetes neropethy from nerve damage to my feet.
When I have put on medication I have been noticed my brain having problems as fog brain, poor concentration, focus, headache, forget words, bad speech for getting words, cheeks pain, teeth issues and even more complicated symptoms.
I didn't realised what all this has caused trouble into my life.
After couple of months I went diagnosed to the assessment to hospital they have been told me by my consultant who has put you on prescription Gabapentin with knowing I don't have diabetes neuropathy.

@mariatela
Everyone reacts very differently to any medication. I have been taking 350 mg 3x a day for several years with no problems. At 82 years old my memory not as sharp as it used to be but aging is not a memory enhancer.

I take 600 milligrams 3x a day and have some short term memory loss which I deal with by writing things down that are important like appointment dates. The other issues you mentioned disappeared over time. I hope that helps.