What is Tresiba Flextouch: Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Dec 30, 2020

Tresiba FlexTouch is a long-acting insulin packaged in a multiple-dose insulin injection pen, the FlexTouch pen. Its active ingredient (insulin degludec) keeps blood sugar low throughout the day in adults and children diagnosed with diabetes mellitus. Doses are self-injected once daily. For children, injections should be made at the same time every day.

Tresiba Flextouch overview

BRAND NAMES:

  • Tresiba, Tresiba FlexTouch

Generic Names:

  • Insulin degludec

Uses:

  • Treats diabetes

Therapeutic Classes:

  • Antidiabetic, long-acting human insulin

Forms:

  • Injectable

How it’s taken:

  • By injection

What is Tresiba Flextouch used for?

Healthcare providers use Tresiba as a basal insulin in adults and children 1 year of age and older with Type 1 diabetes and adults with Type 2 diabetes. Basal insulin treatment helps keep blood sugar levels low throughout the day. Tresiba is not appropriate for managing blood sugar spikes after a meal.

What form(s) does Tresiba Flextouch come in

  • Injection pen

    • 3 mL of 100 units/mL

    • 3 mL of 200 units/mL

What are common Tresiba Flextouch doses?

  • For Type 1 Diabetes:

    • In adults: Doses will vary; injections are administered once daily

    • In children 1 year of age and older: Doses will vary; injections are administered once daily at the same time every day

  • For Type 2 Diabetes: Doses will vary

Common Tresiba Flextouch prescriptions

  • Tresiba FlexTouch
    3ml of 100unit/ml pen

  • Tresiba FlexTouch
    3ml of 200unit/ml pen

How to take Tresiba Flextouch

  • Take this medicine as prescribed. 

  • Please read the Patient Information sheet and Instructions for Use included with the pen. Please follow these instructions each time an injection is administered.

  • Administer only one injection daily.

    • Children should receive injections at the same time every day.

  • A healthcare provider will demonstrate how to administer an injection and where on the body to make an injection. 

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

  • Always check the label before an injection to make sure it’s the correct insulin.

  • How to prepare the Tresiba FlexTouch:

    • Wash your hands.

    • Check the pen to make sure it’s the right insulin and that the pen is undamaged.

    • Pull the cap off to check the medicine. The medicine should appear clear and colorless.

    • If the FlexTouch injector is damaged or the medicine is discolored or cloudy, do not use it.

    • Prepare the pen for its first use by following the step-by-step directions in the Instructions for Use. 

  • How to administer an injection:

    • Injections are made into the skin. Do not inject Tresiba into a vein or muscle.

    • Rotate injection sites for each injection.

    • To prepare the skin, wash your hands and wipe the skin with an alcohol swab. Let dry.

    • Wash your hands.

    • Remove the cap from the injection pen.

    • Attach the needle to the pen. Always use a new needle for each injection. Use only a NovoFine or NovoTwist needle with the FlexTouch.

    • Select the dose using the dose indicator. Doses are indicated in units, so do not do any conversions based on the insulin concentration.

    • Insert the needle into the skin. The dose counter should be visible.

    • Press the injection button and hold it. The dose indicator will gradually fall to “0.”

    • When the dose indicator hits “0,” keep the needle inserted for another six seconds.

    • After six seconds, remove the needle from the skin.

    • Do not recap the needle. Carefully remove it from the pen and dispose of it in a sharps container. 

    • Put the cap back on the FlexTouch injector.

  • Store unused Tresiba FlexTouch pens in the refrigerator (36°F to 46°F). Do not freeze. Throw away the medicine if it freezes.

  • Store used Tresiba pens in a refrigerator or at room temperature (up to 86°F).

  • Used Tresiba pens can be stored and reused for up to 56 days. After 56 days, dispose of any unused medicine.

  • Protect the pen and medicine from heat and light.

  • Keep the FlexTouch pen out of the reach and sight of children.

What to do if you miss a dose of Tresiba Flextouch

  • Take a missed dose if it’s the same day.

  • Take the next dose as scheduled.

  • Do not take doses within eight hours of each other.

  • Do not take a double dose.

  • If a dose is missed in a child, call the doctor for medical advice. Blood sugar levels may need to be checked more often.

Tresiba Flextouch contraindications

  • This medicine is not right for everyone. 

  • Do not use it if you have had an allergic reaction to insulin degludec.

  • Do not use Tresiba when blood sugar is low (hypoglycemia).

  • Do not use the Tresiba FlexTouch in children who require less than five units daily. Use the U-100 vial instead.

  • This medicine is not right for everyone. Do not use it if you had an allergic reaction to insulin degludec.

Tresiba Flextouch warnings

  • Insulin treatment requires regular doctor’s visits and blood tests to make sure the dose is correct and that there are no side effects. Keep all appointments.

  • Make sure other doctors and other healthcare providers are aware you’re taking insulin. 

  • Tell the prescriber if you are pregnant, planning to become pregnant, or breastfeeding.

  • Before starting Tresiba, tell the prescriber about all your medical conditions.

  • Changes in what you eat or other aspects of your life can affect blood sugar levels. Your insulin dose may need to be temporarily modified. Always tell the prescriber about:

    • Changes in your diet

    • Changes in exercise or physical activity

    • Changes in stress

    • Illness

    • Injury or surgery

    • Stopping or starting medications 

  • The most common side effect of insulin treatment is low blood sugar (hypoglycemia). Review the symptoms of hypoglycemia with the prescriber. Follow the doctor’s instructions for handling low blood sugar.  

  • Tresiba can also cause low potassium levels. This, too, can be a serious side effect, so know the clinical signs of low potassium and call a healthcare professional if they occur.

  • Because of the risk of hypoglycemia, insulin treatment increases the risk of accidents and injuries. Do not drive or do any other risky activity until you know how this medicine affects you. 

  • To prevent infections, never share the Tresiba FlexTouch pen or needles with other people.

  • Never use a syringe to draw medicine from the FlexTouch pen.

Tresiba Flextouch interactions

  • Make sure the prescriber knows about all the prescription drugs, over-the-counter medications, and supplements you use, even if they’re only used occasionally.

  • Many drugs raise or lower blood sugar levels or cause other problems when taken with Tresiba or other long-acting insulins. The list is very long and includes:

  • Immediately inform your healthcare team when you start or stop a new drug or supplement.

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

Tresiba Flextouch side effects

Serious side effects

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

  • Dizziness, lightheadedness, sweating, shaking, trembling, racing heartbeats, increased hunger, anxiety, irritability, confusion, blurred vision, slurred speech

  • Muscle twitches, muscle weakness, fatigue, heart palpitations, numbness or tingling

  • Shortness of breath, sudden weight gain, swelling of the ankles or feet

  • Chest pain, trouble breathing, fatigue

  • Allergic reaction: Difficulty breathing, shortness of breath, racing heartbeat, sweating, swelling of the face, mouth, tongue, or throat, unusual drowsiness, confusion, dizziness

Less serious side effects

  • Low blood sugar

  • Weight gain

  • Fluid retention, swelling, puffiness

  • Itching

  • Rash

  • Injection site reactions such as redness or discomfort

  • Long-term injection site reactions such as skin thickening or pits

Sources:

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