What is Fiasp Flextouch: Uses, Warnings & Interactions

Updated Sep 30, 2025  •  Published Dec 30, 2020

Fiasp FlexTouch is a brand-name medication that contains insulin aspart, a rapid-acting synthetic insulin that helps reduce post-meal blood sugar levels in individuals with Type 1 and Type 2 diabetes. It is packaged as a multi-dose injection pen (FlexTouch). Doses are injected at the start of a meal or within 20 minutes of starting a meal.

Fiasp Flextouch overview

BRAND NAMES:

  • Fiasp FlexTouch

Generic Names:

  • Insulin aspart

Uses:

  • Treats diabetes

Therapeutic Classes:

  • Antidiabetic, rapid-acting human insulin analog

Forms:

  • Injection

How it’s taken:

  • By injection

What is Fiasp Flextouch used for?

Fiasp FlexTouch is used to treat Type 1 diabetes in adults and children, as well as Type 2 diabetes in adults. It is a rapid-acting insulin that reduces blood sugar after a meal.

What form(s) does Fiasp Flextouch come in

  • FlexTouch injection pen

    • 3 mL of 100 units/mL insulin aspart

What are common Fiasp Flextouch doses?

  • For post-meal blood sugar control in people with diabetes: Doses will vary

  • For continuous correction of blood sugar levels in people with diabetes: Doses will vary throughout the day

Common Fiasp Flextouch prescriptions

  • Fiasp FlexTouch
    3ml of 100unit/ml pen

How to take Fiasp Flextouch

  • Follow the dosing instructions provided by the prescriber. 

  • Read and follow the instructions on the Patient Information sheet.

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

  • A healthcare provider will provide instructions on how to administer injections and which body areas to use for injections. 

    • Use a different body area for each injection.

  • Do not inject into skin that is tender, damaged, thick, injured, bruised, hard, scaly, lumpy, scarred, or pitted.

  • Administering an injection:

    • Prime the injection pen before its first use. Priming instructions are included with the medicine. 

    • Before giving an injection, check the pen to make sure it is the right insulin and hasn’t passed its expiration date. Check to make sure the medicine is clear and colorless. If it isn’t, throw out the pen.

    • Always use a new needle for each injection. 

    • Use the dose selector to select the prescribed number of units. 

    • Clean the skin with an alcohol swab and let dry.

    • Insert the needle into the skin. The prescriber will tell you whether you need to pinch the skin or not.

    • Make sure the pen’s dose counter is visible.

    • Press and hold the dose button until the dose counter reaches “0.” 

    • Slowly count to six (6).

    • Pull the needle out of the skin.

    • Carefully remove the needle from the pen and dispose of it in a sharps container.

    • Replace the cap on the injection pen.

    • Store used FlexTouch injection pens at room temperature for up to 28 days. Do not refrigerate.

    • Never keep the needle attached to a pen when it’s not being used to administer an injection. 

  • Store unopened FlexTouch pens in the refrigerator. Do not freeze. 

    • Keep the injection pen away from heat and direct light. 

  • Throw away the pen when it has passed its expiration date.

  • Do not share injection pens or needles with other people.

What to do if you miss a dose of Fiasp Flextouch

  • Ask the prescriber what to do if a dose of rapid-acting insulin is missed. 

  • The answer will vary between practitioners.

    • Prescribers typically advise that a missed dose of rapid-acting insulin be taken if you’re still eating or have just finished.

    • Some prescribers may suggest taking the missed dose as much as two hours after a meal. 

    • Taking or skipping a missed dose depends on several factors.

    • Follow the prescriber’s instructions.

Fiasp Flextouch contraindications

  • This medicine is not right for everyone. 

  • Do not use it if you:

    • Are hypoglycemic

    • Have had an allergic reaction to insulin aspart or any of the other ingredients in the injection

Fiasp Flextouch warnings

  • Insulin therapy requires regular doctor’s visits and blood tests. Keep all appointments.

  • Tell all doctors and other healthcare providers that you’re using daily insulin. 

  • Before starting Fiasp Flextouch, tell the prescriber if you are pregnant, planning to become pregnant, breastfeeding, or have kidney or liver problems. 

  • Your lifestyle choices will affect insulin doses. Tell the prescriber about changes in your life that can affect blood sugar, including:

    • Changes in the type or amount of food you eat

    • Changes in exercise or physical activity

    • Increased stress or decreased stress

    • Physical stress like injuries or surgeries

    • Weight changes

  • Low blood sugar is a common issue among individuals who take insulin. 

    • Be familiar with the clinical signs of hypoglycemia, also known as low blood sugar.

    • Follow the healthcare provider’s instructions when blood sugar gets too low.

  • Low blood sugar increases the risk of accidents and injuries. 

    • Do not drive or engage in potentially risky activities until you’re stabilized on insulin. Never drive if your blood sugar is low.

    • Be careful around the house and at work.

  • Low potassium is another common adverse effect of insulin treatment.

    • Be familiar with the clinical signs of low potassium.

    • Contact a healthcare professional or seek medical help if you experience symptoms of low potassium.

  • To minimize the risk of spreading or getting infections, never let other people use your FlexTouch pen or needles. 

  • Do not inject Fiasp into skin that is thick or scarred. 

    • The injection may be less effective and result in hyperglycemia.

Fiasp Flextouch interactions

  • Make sure the prescriber knows about all the prescription drugs, over-the-counter medications, and supplements you use, particularly:

  • Do not drink alcohol or use medications containing alcohol when using insulin.

  • Tell other healthcare professionals treating you about insulin treatment before they prescribe new medications.

  • Always inform your diabetes doctor when you start or stop a new drug or supplement.

Fiasp Flextouch side effects

Serious side effects

Talk to the prescriber or healthcare team if you notice any signs or symptoms of a possible serious side effect, including:

  • Hunger, headache, lightheadedness, dizziness, fast heart rate, sweating, shaking, trembling, anxiety, irritability, mood changes, confusion, slurred speech, blurred vision

  • Muscle weakness, muscle twitching, heart palpitations, fatigue, numbness, tingling

  • Rapid weight gain, swelling in your hands, ankles, or feet, trouble breathing, tiredness

  • Allergic reaction: Itching, skin swelling, whole body rash, fast heartbeat, trouble breathing, shortness of breath, swelling of your face, tongue, or throat, sweating, dizziness, confusion, extreme drowsiness

Less serious side effects

  • Skin problems such as rash, itching, redness, or eczema

  • Injection site reactions

  • Skin thickening or pits at the injection site

  • Weight gain

Find more information about NovoLog side effects here.

Sources:

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