Fiasp is usually injected under the skin (subcutaneous injection). It can be used with a syringe, insulin pen, or insulin pump. Follow your doctor or nurse’s instructions carefully.

Here are some general tips for using Fiasp:

• Inject right before eating (0 to 2 minutes before a meal)
  
  
• You can also inject up to 20 minutes after starting your meal, if needed
  
  
• Rotate injection sites to avoid skin problems
  
  
• Do not use Fiasp if it looks cloudy or colored
  
  
• Store unopened Fiasp in the refrigerator
  
  

Once opened, keep it at room temperature and use it within 28 days

Fiasp is a man-made insulin that works like the insulin your body naturally makes. When you eat food, your body breaks it down into sugar (glucose). This sugar goes into your blood, and insulin helps move that sugar from your blood into your cells, where it is used for energy.

In people with diabetes, the body either doesn’t make enough insulin or can’t use insulin properly. Fiasp works by replacing the insulin your body is missing. Since it starts working very quickly, it helps stop your blood sugar from going too high after you eat.

Fiasp contains niacinamide (vitamin B3) which helps it absorb faster into the bloodstream compared to regular insulin aspart.

Like all medicines, Fiasp can cause side effects, though not everyone gets them. Some common side effects include:

• Low blood sugar (hypoglycemia) – This is the most common side effect. Symptoms include sweating, shaking, fast heartbeat, and feeling weak or hungry.
  
  
• Skin irritation – Redness, itching, or swelling at the injection site
  
  
• Weight gain – Some people may gain weight when starting insulin
  
  
• Allergic reaction – Rarely, some people may have a serious allergic reaction, with symptoms like rash, trouble breathing, or swelling
  
  

If you notice any unusual or severe symptoms, call your doctor or go to the hospital immediately.

Before using Fiasp, you should talk to your doctor if you have:

• Kidney or liver problems
  
  
• Heart problems
  
  
• Allergies to insulin or any ingredients in Fiasp
  
  
• History of low blood sugar
  
  

Fiasp should be used with caution in:

• Pregnant or breastfeeding women – Tell your doctor if you are pregnant or plan to become pregnant
  
  
• Older adults – They may be more sensitive to low blood sugar
  
  

Also, be careful when:

• Driving or using machines – Low blood sugar can affect your ability to concentrate
  
  
• Drinking alcohol – It can increase the risk of low blood sugar
  
  

Always carry sugar tablets, candy, or juice in case your blood sugar goes too low.

Fiasp may interact with other medications, such as:

• Other types of insulin
  
  
• Medicines for high blood pressure
  
  
• Steroids
  
  
• Diuretics (water pills)
  
  
• Certain antidepressants
  
  

Always tell your doctor about all the medicines you are taking, including over-the-counter drugs and herbal supplements. This helps avoid dangerous interactions.

Fiasp dosage is individualized. Your doctor will usually start you with a small dose and adjust it based on your blood sugar levels.

Here are some general dosage guidelines:

• Inject before meals (usually 3 times a day)
  
  
• Your doctor may also tell you to take a long-acting insulin once a day
  
  
• Check your blood sugar levels regularly
  
  
• Keep a record of your insulin doses and blood sugar readings
  
  

Do not change your dose without asking your doctor. Taking too much insulin can cause serious low blood sugar, while taking too little can make your blood sugar too high.

Fiasp is a prescription-only medicine. This means you need a doctor’s prescription to buy it from a pharmacy.

Here’s how to get it:

1. Visit a doctor – They will check your blood sugar and overall health
   
   
2. Get a prescription – The doctor will write how much Fiasp you need
   
   
3. Go to a pharmacy – You can buy Fiasp using the prescription
   
   
4. Follow up regularly – Your doctor may adjust your dose based on your progress
   
   

Do not share your insulin with anyone else, even if they have diabetes. Insulin is personalized, and using the wrong dose can be dangerous.

• What is Fiasp used for?
  It is used to improve blood sugar control in adults and children with diabetes mellitus (type 1 or type 2).
  Fiasp helps manage post-meal (after eating) blood sugar spikes by acting quickly after injection.

• What are the brand names?
  Fiasp® (U.S. and worldwide).

• What is the active ingredient?
  Insulin aspart injection — a rapid-acting insulin analog.

• How does Fiasp work?
  It replaces the insulin normally produced by the pancreas.

  • Starts working within minutes to help glucose enter the body’s cells.

  • Controls blood sugar after meals, preventing spikes.

  • Works faster than traditional insulin aspart (NovoLog®) due to added niacinamide (vitamin B3), which speeds absorption.

• What type of medication is it?
  A rapid-acting insulin analog used for mealtime blood sugar control.

• How is Fiasp administered?

  • Subcutaneous injection (under the skin) using:

    • Fiasp FlexTouch® pen

    • Fiasp PenFill® cartridge

    • Fiasp vials (for syringes or insulin pumps)

  • Can also be used in insulin pumps for continuous delivery.

  • Inject at the start of a meal or within 20 minutes after starting a meal.

• What are the available strengths?

  • 100 units/mL (U-100) solution in:

    • 10 mL vials

    • 3 mL prefilled FlexTouch pens

    • 3 mL PenFill cartridges

• How fast does Fiasp work?

  • Onset: ~2.5 minutes

  • Peak effect: 1–3 hours

  • Duration: 5–7 hours

• What are the common side effects?

  • Hypoglycemia (low blood sugar) — most common

  • Redness, swelling, or itching at the injection site

  • Weight gain (with long-term use)

  • Headache or dizziness

  • Nasal congestion (rare)

• What are signs of low blood sugar (hypoglycemia)?

  • Shaking, sweating, dizziness, hunger, irritability, or confusion

  • Severe cases can cause seizures or loss of consciousness

• How to treat low blood sugar?

  • Consume 15 grams of fast-acting carbohydrates (glucose tablets, juice, or sugar) immediately.

  • Always carry a source of glucose and wear a diabetes ID bracelet.

• Are there serious side effects?
  Yes, but rare:

  • Severe allergic reaction (rash, swelling, trouble breathing)

  • Severe hypoglycemia

  • Potassium imbalance (hypokalemia)

• Who should not take Fiasp?

  • People with hypoglycemia (low blood sugar) at the time of injection

  • Individuals allergic to insulin aspart or any component of the formulation

• Can Fiasp be mixed with other insulins?

  • Do not mix Fiasp with other insulins in a pump.

  • If injected manually, it can sometimes be used with long-acting insulins (e.g., insulin glargine) — but not in the same syringe.

• Can Fiasp be used in insulin pumps?
  Yes — it is approved for continuous subcutaneous insulin infusion (CSII) systems.

• Can Fiasp be used during pregnancy?
  Yes — insulin aspart (the same molecule) has been shown to be safe and effective during pregnancy when blood sugar is carefully monitored.

• Can I take it while breastfeeding?
  Yes — insulin does not pass into breast milk in harmful amounts.

• Does Fiasp interact with other medications?
  Yes — use caution with:

  • Beta-blockers (can mask signs of low blood sugar)

  • Steroids, diuretics, or oral diabetes meds (can raise or lower blood sugar unpredictably)

• Can I drink alcohol while taking Fiasp?
  Limit alcohol — it can increase risk of hypoglycemia, especially if meals are skipped.

• Where should I inject Fiasp?

  • Common sites: abdomen, thigh, or upper arm.

  • Rotate injection sites to prevent lipodystrophy (skin thickening or dimpling).

• How should I store Fiasp?

  • Unopened pens or vials: Refrigerate at 2°C–8°C (36°F–46°F).

  • In use: Can be stored at room temperature (below 30°C / 86°F) for up to 28 days.

  • Do not freeze.

• Is there a generic version available?
  No — Fiasp is currently a brand-only product (by Novo Nordisk).

• Where can I get Fiasp?
  Available by prescription only from pharmacies.