Hello yall I have been on Lyrica for about 3 weeks now. Two days ago I started with sores in my mouth. Right now I have 2 sores. Does anyone else have this problem? If so what did you do? Also is it common to start a side effect 3 weeks into taking meds. I have also started the morphine sulfate at the same time but I'm thinking it couldn't be this. Or could it? Any information will be helpful.