We saw Dr T for first time on 3/30. He reviewed labwork with us last week, saw DS14 had EBV (mono)... (recently b/c we had him tested twice last year and both were negative, last test was Nov 2012). Started him on Valtrex. Also started clindamycin, since he had never taken that before. He then got a lesion outside lower lip, that looks like herpes simplex...so valtrex should help this as well. On top of alll this, he lost his last baby tooth, a molar. So, this may have introduced bacteria, but he was on the abx. Since all this has started, he has developed the mouth tic again, like an OCD complusion to bite and suck the inside of his left cheek. He has had this before, and has now come back in full force. So, he has an open ulcer in his mouth. We are treating with salt water and peroxide rinses. He cannot attend school, hard to eat and drink, in lots of pain. We give him pain meds. Was just wondering if valtrex would CAUSE this, he has never had this anti-viral drug before. We are afraid he will have to be hospitalized...but, that might make things worse, trying to explain everything, etc.