A patient with chronic congestive heart failure has repeated hospitalizations in spite of ongoing ...

A patient with chronic congestive heart failure has repeated hospitalizations in spite of ongoing treatment with hydrochlorothiazide (HydroDIURIL) and digoxin.
 
  The prescriber has ordered spironolactone (Aldactone) to be added to this patient's drug regimen, and the nurse provides education about this medication. Which statement by the patient indicates understanding of the teaching?
  a. I can expect improvement within a few hours after taking this drug.
  b. I need to stop taking potassium supplements.
  c. I should use salt substitutes to prevent toxic side effects.
  d. I should watch closely for dehydration.