Fasenra Pen

Generic name: benralizumab [ BEN-ra-LIZ-ue-mab ]
Brand names: Fasenra Pen, Fasenra Prefilled Syringe
Drug class: Interleukin inhibitors

Medically reviewed by Drugs.com on Mar 3, 2025. Written by Cerner Multum.

What is Fasenra Pen?

Fasenra Pen is used together with other medicines to help control severe asthma in adults and children who are at least 6 years old. This medicine is not a fast-acting rescue medicine for asthma attacks.

Fasenra Pen is also used in adults to treat a rare autoimmune disorder called eosinophilic granulomatosis with polyangiitis (EGPA).

Fasenra Pen may also be used for purposes not listed in this medication guide.

Fasenra Pen side effects

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

Fasenra Pen may cause serious side effects. Call your doctor at once if you have:

• new or worsening asthma symptoms.

Common side effects of Fasenra Pen may include:

• sore throat; or

• headache.

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.

Related/similar drugs

Warnings

Use only as directed. Tell your doctor if you use other medicines or have other medical conditions or allergies.

Before taking this medicine

You should not use Fasenra Pen if you are allergic to it.

Tell your doctor if you have or have ever had:

• infection caused by helminthic parasites; or

• an oral or inhaled steroid medicine.

It is not known if Fasenra Pen will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.

Ask a doctor if it is safe to breastfeed while using Fasenra Pen.

How should I use Fasenra Pen?

Follow all directions on your prescription label and read all medication guides or instruction sheets. Use the medicine exactly as directed.

Fasenra Pen is injected under the skin in the stomach, thigh, or upper arm. A healthcare provider may give you this injection or may teach you how to properly use this medicine by yourself.

This medicine should only be given by a caregiver or healthcare provider to children younger than 12 months old.

Fasenra Pen is usually injected once every 4 weeks. Later doses are then injected once every 8 weeks for certain indications. Your doctor will determine your treatment schedule.

Read and carefully follow any Instructions for Use provided with your medicine. Ask your doctor or pharmacist if you don't understand how to use an injection.

Prepare an injection only when you are ready to give it. Call your pharmacist if the medicine looks cloudy, has changed colors or has particles in it.

Do not inject within 2 inches of your navel, or areas where the skin is tender, hard, scaly, bruised, or has scars. Do not inject into the same place two times in a row.

If you take oral steroid medicine, do not stop it suddenly. Ask your doctor about tapering your dose.

Fasenra Pen is not a fast-acting rescue medicine for asthma attacks. Seek medical attention if your breathing problems get worse quickly, or if you think your medications are not working.

Each autoinjector is for one use only. Throw away after one use, even if there is still medicine left inside. Place them in a puncture-proof "sharps" container and dispose of it following state or local laws. Keep out of the reach of children and pets.

Call your doctor if your symptoms do not improve, or if they get worse.

Your dose needs may change due to surgery, illness, stress, or a recent asthma attack. Do not change your dose or stop using asthma medication without your doctor's advice. Tell your doctor if your medicine seems to stop working.

Store this medicine in the original container in the refrigerator. Protect from light and do not freeze or shake the medicine.

Take the medicine out of the refrigerator and follow the instructions to let it reach room temperature before using the medicine. Do not warm the medicine with hot water, sunlight, or a microwave.

Fasenra Pen may also be stored at room temperature away from moisture and heat. Do not return the medicine to the refrigerator. Throw the medicine away after 14 days if stored at room temperature.

What happens if I miss a dose?

Call your doctor for instructions if you miss a dose.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

What should I avoid while using Fasenra Pen?

Follow your doctor's instructions about any restrictions on food, beverages, or activity.

What other drugs will affect Fasenra Pen?

Other drugs may affect Fasenra Pen, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell your doctor about all other medicines you use.

Biological Products Related to benralizumab

Find detailed information on biosimilars for this medication.

Popular FAQ

More FAQ

• What type of asthma is Fasenra used to treat?

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Medical Disclaimer

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