I had a scope 2 weeks ago and I have pouchitis. In the past, I have been prescribed 250mg of flagyl 2 times a day that had a coating on the pill. This time I was prescribed 500mg 3 times a day that starts to dissolve as soon as I put it in my mouth which taste terrible by the way.. Not very long after taking the 500mg, I get a weird feeling in my head. I never had that feeling with the 250 mg. Has anyone else ever had a strange feeling after taking flagyl?