A client with diabetes mellitus is receiving insulin glargine (Lantus). The nurse should monitor the client for which of the following side effects?
Correct Answer: A
Rationale: Insulin glargine is a long-acting insulin used to control blood sugar levels in diabetes. The nurse should monitor the client for hypoglycemia, which is a potential side effect of insulin therapy. Hypoglycemia occurs when blood sugar levels drop too low, leading to symptoms such as shakiness, dizziness, sweating, confusion, and in severe cases, loss of consciousness. Hyperkalemia (choice B) is an elevated potassium level, not typically associated with insulin glargine. Hypertension (choice C) is high blood pressure, which is not a common side effect of insulin glargine. Hypercalcemia (choice D) is an elevated calcium level and is not related to the use of insulin glargine.