A client with chronic syndrome of inappropriate antidiuretic hormone (SIADH) reports to the nurse of being constantly thirsty. Which action should the nurse take?

Choice A reason: Providing additional oral fluids is not appropriate for SIADH and can worsen fluid retention. Choice B reason: Measuring glucose levels is important for diabetes management but not directly related to SIADH. Choice C reason: Offering hard candy stimulates saliva production and soothes oral mucosa, providing relief of dry mouth and the perception of thirst without adding significant fluid volume, thereby supporting strict fluid restriction in SIADH management. Choice D reason: Withholding a prescribed diuretic without a clear order can disrupt the therapeutic plan, exacerbate fluid retention, and falls outside the nurse’s scope; diuretic adjustments should only follow provider directions.