Fiasp is a fast-acting insulin formulation used to improve blood sugar control in adults and children with diabetes mellitus. It is a brand name for insulin aspart, a rapid-acting insulin analog that mimics the insulin response of a healthy pancreas immediately after meals. Fiasp is designed to be taken at the beginning of a meal or within 20 minutes after starting a meal, providing flexibility for patients managing their mealtime insulin needs. Its rapid onset of action helps in controlling post-meal blood sugar spikes, making it an essential part of diabetes management for those requiring insulin. Fiasp can be administered via injection or through an insulin pump, offering versatility in how it can be used to fit individual treatment plans and lifestyles.