]> 2026-07-31T07:53:04+00:00 WBR0001 0 en Carbamazepine Gabapentin Venlafaxine Amitriptyline Lithium Lithium is a mood stabilizer used to treat bipolar disorder. Its mechanism of action is poorly understood. Administration of lithium is associated with the development of hypothyroidism, which is responsible for the menstrual irregularities, constipation, and fatigue in this patient. Further questioning might demonstrate other manifestations of hypothyroidism, such as cold intolerance, hair loss, and reduced concentration capacity. Behavioral Science/Psychiatry Pharmacology Anonymous (Reviewed by Will Gibson, Alison Leibowitz, and Yazan Daaboul) A 23-year-old woman presents to her primary care physician with complaints of depression, insomnia, and decreased appetite. She reports that these symptoms often alternate with episodes of excited mood and euphoria. The patient is referred to a local psychiatrist for appropriate management. Two months later, the patient returns and reports improvement of her mood swings following daily intake of a medication whose name she cannot recall. She now complains of recent menstrual irregularities, constipation, and fatigue. Which of the following drugs was this patient most likely prescribed? E Neurology 2020-10-27T23:01:33Z 2459150.4594097 WBR0001