JC, a 58-year-old patient, has been recently diagnosed with hypertension. His resting blood pressure is 158/92. He is prescribed hydrochlorothiazide 50 mg/day and told to eat foods rich in potassium.  
 
After 1 month on hydrochlorothiazide therapy, JQ becomes weak and complains of nausea and vomiting. His muscles are “soft.” His serum potassium level is 3.3 mEq/L. JQ’s diuretic is changed to triamterene/hydrochlorothiazide (Dyazide). Again, he is advised to eat foods rich in potassium.                                                                                              
 
What nursing interventions should the nurse follow for JQ?