I take Valtrex for cold sores. If you start taking it when you first feel that tingle on your lip then it goes away quicker or even stops it before it gets to a sore. I take two a day few a few days during those times.
I get canker sore every time I eat any substantial amount of acidic tasting raw fruits or juices. Other things (colds, UC flare) can bring them on too but I bet you can find a relation to something you're eating or taking (too much vitamin C maybe?) and canker sores forming.
UC diagnosed in 1985
Flares usually occur after some illness: food poisoning, flu, mono
Flares last 1/2 to 1 1/5 yrs and are severe with lots of diarrhea, blood, pain, fever, dehydration
Remissions last 1 to 4 years and are absolute with no symptoms
Current Meds: 100 mg azathioprine, Colazal, Lialda,
60 mg 50 mg 60mg 80 mg prednisone
Xanax, Valium for anxiety
Tegretol XR for epilespy