Which of the following drug treatment increases thirst and causes dilute diuresis?: (A) Phenobarbitone, (B) Lithium, (C) Chlorpromazine, (D) Clozapine
Answer is B. Lithium is a drug of low therapeutic index and side effects are nausea , vomiting, mild diarrhea, edema, thirst bad polyuria. Tremors , hypothyroidism, weight gain and diabetes insipidus can also occur. All the other drugs donot have such a side effect Ref: KD Tripati 8th ed.