An elderly client is prescribed sulfisoxazole (Gantrisin). Knowing that one of the major adverse effects of this drug is crystalluria, the nurse should instruct the client to: 1. Limit intake of foods...

An elderly client is prescribed sulfisoxazole (Gantrisin). Knowing that one of the major adverse effects of this drug is crystalluria, the nurse should instruct the client to:

1. Limit intake of foods high in calcium such as milk, cheese, and yogurt.

2. Avoid changing positions (lying down, sitting, or standing) rapidly.

3. Increase fluid intake to 2 to 3 L per day.

4. Avoid consuming alcoholic beverages while taking this medication.