Some of the uncommon side effects of tegretol xr that can become severe include sudden behavioral changes in children, agitation, confusion especially in elderly people , loss of touch with reality, loss of balance or control over actions, trembling of muscles, stiffness or jerking, nausea followed by severe vomiting, unsteady and shuffling walk, sudden mood swings, suicidal thoughts, constant tiredness and insomnia, twisting and uncontrolled movements of the neck, back, and face, and loss of interest.
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