What should the nurse provide to the client before starting treatment for diabetes insipidus with desmopressin?

Desmopressin is a synthetic analogue of vasopressin (antidiuretic hormone) used in the treatment of central diabetes insipidus, which results in excessive urination and thirst due to insufficient levels of this hormone. When starting treatment with desmopressin, it is essential to ensure that the client has access to water. This is crucial because desmopressin acts to decrease urine output and increase water reabsorption in the kidneys, but it can also lead to fluid retention and potential water intoxication.

By providing unlimited access to water, the client can adequately hydrate themselves based on their individual thirst and prevent dehydration, which can occur due to the increased urination characteristic of diabetes insipidus. This access is particularly important during the initial phases of treatment, as adjustments to the dosing may be necessary based on how the body responds to the medication.

In contrast, while medication information, water intake restrictions, or lifestyle changes might be relevant, they do not directly address the immediate need for hydration that is critical before and during the initiation of desmopressin therapy. Ensuring that the client can hydrate freely is the most pertinent action to support their health and the effectiveness of the treatment.