Metformin
diabetes, type 2
"I was on Meformin for about a month (500mg twice a day).  I was told that it would give me stomach problems and loose stools, but since I have irritable bowel syndrome, that didn't worry me.  As it turns out, this medicine had the opposite affect.  I had constipation all the time.  Only a good dose of laxatives would help, but even then I had to strain pretty hard to relieve myself.  Finally, my doctor decided to take me off the medication, since my readings were in the mid 80's.  I've been off for about two days and I'm feeling very light-headed.  I'm hoping this will pass soon.  My readings are still good, and the constipation is abating."