In March 2020, a 62-year-old Iranian woman with bipolar I disorder was referred to the psychiatry outpatient clinic of the Ali Ibn Abi Talib Hospital, Zahedan, Iran, due to a depressive episode with psychotic features (and with mixed features), as well as the rise of Parkinsonism. The patient was first treated with lithium carbonate (300 mg three times a day) after being hospitalized due to a manic episode at the age of 24. After this, she remained euthymic for more than 30 years. However, there were a 15-year history of dreamenacting behaviors and nearly 2 years of cognitive fluctuations in the patient's past psychiatric history. During the recent episode, despite regular consumption of lithium carbonate (serum lithium concentrations of 0.8 mmol/L), she suffered from symptoms such as fluctuating cognition, depressed mood, feelings of worthlessness, markedly diminished interest, fatigue, significant weight loss, decreased need for sleep, increased talkativity, flight of ideas, persecutory delusion, and recurrent complex visual hallucinations. Moreover, resting tremor in 4-6 Hz range, bradykinesia, symmetric cogwheel rigidity in