The nurse is preparing to administer the cardiac glycoside digoxin to a patient. The nurse knows which of the following are correct? Select all that apply.
a. Inform patients that failure to take digoxin exactly as prescribed may lead to toxicity or therapeutic failure.
b. Advise patients to limit salt intake to 3000 mg/day and to avoid excessive fluids.
c. Visual disturbances (blurred or yellow vision) frequently indicate a therapeutic effect and provider should be notified.
d. Teach patients to recognize early signs of hypokalemia (e.g., muscle weakness) , and instruct them to notify the prescriber if these develop.