Metronidazole
"My wisdom tooth crumbled out last week so being referred to get 4 out. In mean time dentist thinks this has caused an infection. I'm in agony on that side of my mouth hurts to swallow etc. Prescribed 7 day course of metronidazole I'm onto the 6th day today and I'm still in agony and having to take painkillers through the night I wish it would go away!  I also have severe ulcerative colitis so I'm on a mixture of meds. These have made me ill since first day I actually nearly fainted Saturday. Slurring my words shaking and hot/feeling sick. Does awful things to your jaw and makes an awful taste.  Personally haven't worked for me I'm allergic to penicillin so this was the best option."