Font Size

Medications and Drugs

Brand Names: Abstral

Generic Name: fentanyl (sublingual) (Pronunciation: FEN tan il sub LIN gwal)

What is fentanyl sublingual (Abstral)?

Fentanyl sublingual (under the tongue) is a narcotic pain medicine.

Fentanyl sublingual tablets (Abstral) are used to treat "breakthrough" cancer pain. Abstral is taken together with other non-fentanyl narcotic pain medicine that is used around the clock. Abstral is not for treating pain that is not cancer-related, such as pain from surgery or dental work, migraine headaches, or back pain.

Fentanyl sublingual may also be used for purposes not listed in this medication guide.

What are the possible side effects of fentanyl (Abstral)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using fentanyl and call your doctor at once if you have a serious side effect such as:

  • slow heart rate, weak or shallow breathing, sighing;
  • confusion, extreme fear, unusual thoughts or behavior; or
  • feeling like you might pass out.

Less serious side effects may include:

  • nausea, dry mouth, constipation;
  • headache, drowsiness, tired feeling; or
  • white patches or sores inside your mouth or on your lips.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is the most important information I should know about fentanyl (Abstral)?

Before taking fentanyl, tell your doctor if you have a breathing disorder (asthma, wheezing, COPD), slow heartbeats, seizures, mental illness, low blood pressure, liver or kidney disease, a debilitating condition, or a history of head injury, brain tumor, or addiction to drugs or alcohol.

Tell your doctor if there are children living in the home where you will store this medicine. Keep Abstral out of the reach of children. The amount of fentanyl in each Abstral tablet can be fatal to a child.

Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Pill Identifier Tool

Need help identifying pills and medications?
Use the pill finder tool on RxList.