A nurse is providing teaching to a client who has a history of diabetes mellitus and a new prescription for hydrochlorothiazide to treat uncontrolled hypertension. Which of the following information should the nurse include in the teaching?

Choice A rationale Blood glucose monitoring accuracy is generally not directly affected by hydrochlorothiazide. The medication's impact is on glucose metabolism itself, not the accuracy of the measurement device. Hydrochlorothiazide affects the pancreatic beta cells or peripheral insulin sensitivity, leading to altered glucose homeostasis, not erroneous readings from a glucometer. Choice B rationale Decreasing insulin dosage is generally not appropriate when taking hydrochlorothiazide. Hydrochlorothiazide, a thiazide diuretic, can induce hyperglycemia by impairing insulin secretion from the pancreatic beta cells or by reducing peripheral glucose utilization, thereby requiring an *increase* in insulin dosage to maintain glycemic control, not a decrease. Choice C rationale Hydrochlorothiazide therapy can elevate blood glucose levels in clients who have diabetes. This effect is attributed to the medication's ability to impair insulin secretion from pancreatic beta cells or to decrease peripheral glucose utilization, leading to insulin resistance. This necessitates careful blood glucose monitoring (normal fasting glucose <100 mg/dL). Choice D rationale Reducing sodium in the diet while taking hydrochlorothiazide is beneficial for blood pressure control by augmenting the diuretic's effects, but it does not directly control blood glucose levels. While a healthy diet supports overall health, the primary mechanism of glucose elevation from hydrochlorothiazide is metabolic, not sodium-related.