30 years old male presented in opd with the chief complaints of frequency of urination and polydypsia but not polyphagia and weight loss. He is under amphotericin B for fungal infection .On Lab 24 hr urine osmolarity shows less than 300 mosmol/L, the patient has a water diuresis and urine osm is also less so the patient is evaluated under Diabetes insipidus, Desmopressin (10microgam IN tid) is given but no improvement of urine osmolarity so he is diagnosis of Nephrogenic diabetes insipidus and managed with given chlorothiazide.

So my question is, why this patient is treated with the chlorothiazide, which is a diuretic drug?

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