Tegretol side effects

Another day more pain 🤣😭. My pain management dr has advised me to start taking Tegretol (Carbamazepine) at night to help me sleep and avoid day time side effects of the tablets. I woke up this morning and my gums were really sore to touch and feel a bit swollen. Has anyone else had this side effect from the tablets? Can’t think of what else it would be. Thanks