Final answer:
Mrs. Kidway is taking digoxin for heart-related conditions such as atrial fibrillation or heart failure, as it helps improve blood circulation and reduce symptoms.
Step-by-step explanation:
Mrs. Kidway is likely taking digoxin for a medical condition related to her heart. Digoxin is a medication commonly prescribed for the treatment of various heart conditions, including atrial fibrillation, atrial flutter, and heart failure. It works by slowing down the rate of the heart and increasing the force of heart contractions, which helps to improve blood circulation and reduce symptoms related to heart conditions, such as shortness of breath and swelling in the legs.