A nurse is reinforcing teaching with the guardian of a preschooler who has heart failure and a prescription for furosemide. Which of the following instructions should the nurse include?

"Administer the medication early in the day."

"Restrict foods that are high in potassium in your child's diet."

"Anticipate that your child will gain weight rapidly while taking this medication."

"Expect your child's urine to appear concentrated and dark yellow."