What are Fiasp and Novolog?

Fiasp and Novolog are insulin aspart medications. Both medications are fast acting and begin to work approximately 15 minutes after injection. The effects peak approximately 1 hour after injection and last for up to 4 hours.

What are these medications used for?

Fiasp and Novolog are used to improve blood sugar stability in adult patients with type 1 or type 2 diabetes. Novolog is also indicated for use in treatment of type 1 diabetes in children who are 2 years of age and older.

How to take these drugs

Fiasp and Novolog are injected under the skin or infused into a vein. Patients should eat a meal within 5 to 10 minutes of using FIasp or Novolog. Unused preparations of the medication should be stored at room temperature and used within 28 days.

Fiasp and Novolog side effects

Fiasp and Novolog are safe and effective insulin medications. However, some side effects may occur as a result of use.

Common side effects

  • Body aches or pain
  • Cough
  • Diarrhea

Severe side effects

  • Bloating or swelling in the face, arms, hands, lower legs, or feet
  • Difficulty swallowing or breathing
  • Unusual weight gain or loss


The dosage requirements should be adjusted according to the patient’s blood glucose monitoring results, metabolic needs, and glycemic control goal. However, the typical dosage when starting Fiasp or Novolog for adults is 0.5 to 1 unit/mL.

Doctor’s Recommendation

If personal finance or insurance allows for insulin Fiasp then it is a better alternative to Novolog since rapid glucose correction during a meal is always desirable. Novolog is meant to be taken 10 minutes before the start of a meal whereas Fiasp may be taken just before a meal or soon after finishing a meal. This reduces the risk of interruption via a telephone call and mistiming the dosage resulting in a hypoglycemic episode,

Disclaimer: Please note that the contents of this community article are strictly for informational purposes and should not be considered as medical advice. This article, and other community articles, are not written or reviewed for medical validity by Canadian Insulin or its staff. All views and opinions expressed by the contributing authors are not endorsed by Canadian Insulin. Always consult a medical professional for medical advice, diagnosis, and treatment.