A patient is prescribed 15 units of regular insulin (U-100) to be taken before meals. Which syringe size should the nurse choose to ensure accurate dosing?

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.

A. It identifies the active ingredients in the medication: Identifying active ingredients helps with medication recognition and allergy prevention, but it does not guide how the medication should be taken. Safety related to administration depends more on correct dose, route, and timing rather than ingredient identification alone.

B. It lists all potential side effects in detail: Drug labels typically summarize common or serious side effects rather than listing all possible reactions. While awareness of side effects is important, this information does not enhance safety related to correct use and administration.

C. It specifies the expiration date and storage requirements: Expiration dates and storage instructions help maintain medication potency and effectiveness, but they do not guide the user on how much medication to take or how to administer it safely.

D. It provides guidelines for proper administration and dosage: Instructions for use directly support medication safety by ensuring the correct dose, route, frequency, and timing are followed. Proper administration reduces the risk of underdosing, overdosing, and medication errors.