Gabapentin
"It was given to my 91 yr. old mother 3 times a day for the nerve damage in her feet.  The medicine relieved her pain, but she became very lethargic.  There were days when she she was so out of it she could not sit 5 minutes without falling asleep. She had swelling in her knees, hand tremors and was not able to communicate properly.  Only after I read about the side effects did I realize her condition was possibly because of the neurotin. The Dr.  changed it from 3 times to 2 times a day and in a matter of 2 days my mother was back to herself and her foot problem was much better."