A pаtient is receiving prednisоne аs pаrt оf treatment fоr severe arthritis. He is also receiving furosemide (a loop diuretic), levothyroxine (for hypothyroidism), and a proton pump inhibitor and antacid (for gastroesophageal reflux disease). Which drug does the nurse identify as the most likely to be a concern during the therapy with prednisone?