Key takeaways
Fiasp (insulin aspart) and NovoLog (insulin aspart) are both fast-acting insulins used to control blood sugar levels in people with diabetes. While they share the same active ingredient, insulin aspart, Fiasp contains additional ingredients, niacinamide (vitamin B3) and L-arginine, which help it work faster than NovoLog. You can inject Fiasp at the start of a meal or within 20 minutes after starting a meal, whereas NovoLog needs to be injected 5 to 10 minutes before a meal. Fiasp starts working in about 16-20 minutes, while NovoLog begins to lower blood sugar within 15 minutes. Fiasp's effects last about 5 to 7 hours, compared to NovoLog's 2 to 4 hours. Both medications can cause weight gain and low blood sugar. Fiasp is available in various forms, including vials, pens, and cartridges, while NovoLog is available as vials, cartridges, and prefilled pens.
