Talk with your health care provider about possible side effects

What are the possible side effects of Tresiba®?

Tresiba® may cause serious side effects that can lead to death, including:

  • Low blood sugar (hypoglycemia). Signs and symptoms that may indicate low blood sugar include:
  • dizziness or light-headedness
  • sweating
  • confusion
  • fast heartbeat
  • blurred vision
  • slurred speech
  • shakiness
  • anxiety, irritability, or mood changes
  • hunger
  • headache
  • Low potassium in your blood (hypokalemia).
  • Heart failure. Taking certain diabetes pills called thiazolidinediones or “TZDs” with Tresiba® may cause heart failure in some people. This can happen even if you have never had heart failure or heart problems before. If you already have heart failure, it may get worse while you take TZDs with Tresiba®. Your health care provider should monitor you closely while you are taking TZDs with Tresiba®. Tell your health care provider if you have any new or worse symptoms of heart failure including shortness of breath, tiredness, swelling of your ankles or feet, and sudden weight gain. Treatment with TZDs and Tresiba® may need to be adjusted or stopped by your health care provider if you have new or worse heart failure.

Your insulin dose may need to change because of:

  • change in level of physical activity or exercise
  • weight gain or loss
  • increased stress
  • illness
  • change in diet

Common side effects of Tresiba® may include:

  • serious allergic reactions (whole body reactions), reactions at the injection site, skin thickening or pits at the injection site (lipodystrophy), itching, rash, swelling of your hands and feet, and weight gain

Get emergency medical help if you have:

  • trouble breathing, shortness of breath, fast heartbeat, swelling of your face, tongue, or throat, sweating, extreme drowsiness, dizziness, or confusion

These are not all the possible side effects of Tresiba®. Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088. 

Questions for your doctor

We’ve prepared some questions to help guide the conversation with your health care provider.

Get the guide 

Still have questions about Tresiba®?

We’ve answered many of the more frequently asked questions here so you can learn more about Tresiba® and the Tresiba® FlexTouch® pen.

Read the FAQs