yeah i'm on mepergan. i'm allergic to codeine and darvocet does a number on my stomach so i find it's the best thing out there that won't make me feel all nauseous.tiny dancer said:I know what you are going through. My face hurted all over for I had my upper gums done. Yeah the mouthpiece really sucks. Did they gave you some painkillers, and are you able to eat anything?