Final answer:
Insulin lispro, marketed as Humalog, is a rapid-acting insulin to control blood sugar around meal times and should not be taken if meals are not planned due to the risk of hypoglycemia.
Step-by-step explanation:
The rapid-acting insulin Humalog, also known as insulin lispro, is a medication used to control blood sugar levels in individuals with diabetes. It is designed to work quickly and should be taken shortly before or after meals to help manage the rise in blood sugar that occurs with eating.
Given its rapid onset, it should not be administered when meals are not planned, or there is a high risk of developing low blood sugar (hypoglycemia). Always follow health care provider instructions when using insulin lispro and monitor blood glucose levels as directed.