When administering insulin glargine, what is the most important consideration?

A. It should be administered at the same time every day: Insulin glargine is a long-acting insulin that provides a steady basal level of insulin over 24 hours. Administering it at the same time each day helps maintain consistent blood glucose control and reduces the risk of hyperglycemia or hypoglycemia caused by fluctuating insulin levels.

B. It should be shaken vigorously before administration: Insulin glargine is a clear solution that should never be shaken, as vigorous shaking can cause air bubbles and compromise the insulin’s effectiveness. Gentle handling or rolling between hands is recommended to maintain proper dosing.

C. It must be mixed with short-acting insulin in the same syringe: Insulin glargine cannot be mixed with any other insulin in the same syringe because it can alter its pharmacokinetics, reducing its effectiveness and potentially causing unpredictable blood glucose changes. It must be administered separately from other insulins.

D. It should be administered intravenously for faster absorption: Insulin glargine is designed for subcutaneous administration only and provides a slow, steady release. IV administration is inappropriate and could result in severe hypoglycemia and loss of the intended basal insulin effect.