Final answer:
The nurse should administer magnesium hydroxide PRN in response to the client's statement, "I am constipated."
Step-by-step explanation:
The nurse should administer magnesium hydroxide PRN in response to the client's statement, "I am constipated." Magnesium hydroxide is a laxative commonly used to relieve constipation. It works by drawing water into the intestines, which helps soften the stool and promote bowel movements.