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If her Depression
started within few weeks of stoppage of tegretol
then it may be related to stoppage of tegretol because tegretol itself has mood stabilizing action.
Her current treatment appear adequate to me. Her doses may change later according to treatment response.
Total duration of treatment is difficult to ascertain in current situation. Recurrent and severe cases sometime needed medicine for lifelong.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal