Alterations of thyroid function have been reported in combination therapy with other anticonvulsant medications. In dogs, tegretol kaina it produced brownish discoloration, presumably metabolite, in the urinary bladder at dosage levels of 50 mg kg and higher. The most frequently observed adverse reactions, particularly during the initial phases of therapy, are dizziness, drowsiness, unsteadiness, nausea, and vomiting. The ratio of the concentration in breast milk to that in maternal plasma is about. Keep list of all your medications with you, and share the list with your doctor and pharmacist. Do not start using new medication without telling your doctor. Tegretol-XR tablets must be swallowed whole and never crushed or chewed.