Question

scenario: a patient with bipolar disorder on lithium therapy presents with polyuria and polydipsia. question: what is the most likely cause of these symptoms? diabetes mellitus. lithium - induced nephrogenic diabetes insipidus. psychogenic polydipsia. hypercalcemia.

Explanation:

Lithium therapy is known to cause nephrogenic diabetes insipidus, which presents with polyuria (excessive urination) and polydipsia (excessive thirst). Diabetes mellitus is related to insulin issues, psychogenic polydipsia is psychological, and hypercalcemia has different primary symptoms. So the most likely cause here is lithium - induced nephrogenic diabetes insipidus.

Answer:

B. Lithium - induced nephrogenic diabetes insipidus.