A client is admitted with congestive heart failure (CHF) exacerbation. The nurse notes that the client takes metformin and furosemide at home. Which of the following findings indicate the presence of a side effect associated with concurrent use of these two medications?

• The client is sweating and shaking
• The client has a heart rate of 58 and a blood pressure of 150/88
• The client has numbness and tingling in the extremities
• The client complains of tenderness and redness in the left lower leg