What instruction should be provided to a patient regarding the timing of insulin administration?

The correct instruction regarding the timing of insulin administration is to take it right before meals. Administering insulin shortly before meals is crucial for managing blood glucose levels effectively. Rapid-acting insulin is typically used for this purpose, as it begins to lower blood glucose levels within about 15 minutes, making it highly effective for controlling postprandial hyperglycemia (the rise in blood sugar after eating). By taking the insulin just before meals, the patient ensures that the medication is at peak effectiveness when the glucose from the meal enters the bloodstream.

Timing is essential because significant blood sugar fluctuations can occur after eating. If insulin is administered too late, it may not work effectively, leading to increased blood sugar levels which can cause complications over time. Proper education on the timing of insulin administration is a critical component of diabetes management.