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Abrupt normalization of hyperthyroid state with antithyroid drugs is reported to precipitate psychosis. We report the development of acute psychosis in a 20-year-old woman, following 30 days use of tablet carbimazole 10 mg for hyperthyroidism due to the multinodular goiter. At the time of presentation, she was euthyroid with a resolution of hyperthyroid status both clinically and biochemically. After 20 days treatment with tablet olanzapine 10 mg/day and stoppage of carbimazole, psychotic symptoms remitted completely and she has since remained in a euthyroid state and free from psychotic symptoms. This case highlights the development of psychosis in individuals, following rapid restoration to normal serum thyroid hormone levels in hyperthyroid individuals with carbimazole.