Concizumab

Generic name: concizumab [ kon-SIZ-ue-mab- ]
Brand name: Alhemo Prefilled Pen
Dosage form: subcutaneous solution (mtci 150 mg/1.5 mL; mtci 300 mg/3 mL; mtci 60 mg/1.5 mL)
Drug class: Miscellaneous coagulation modifiers

Medically reviewed by Drugs.com on Apr 1, 2025. Written by Cerner Multum.

What is concizumab?

Concizumab is used in adults and children at least 12 years old with certain types of hemophilia to help prevent bleeding episodes or make them occur less often.

Your doctor will make sure you can be treated with concizumab.

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

Concizumab 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.

Concizumab can cause unwanted blood clots, especially if you also use other medicines to help treat bleeding episodes or if you have certain other conditions. Call your doctor at once if you have:

• sudden numbness or weakness (especially on one side of the body), severe headache, slurred speech, confusion;

• problems with vision or balance, eye pain or swelling;

• severe chest pain, sudden cough or shortness of breath, coughing up blood;

• sudden stomach or back pain; or

• swelling, or warmth in one leg.

Common side effects of concizumab may include:

• pain, bruising, swelling, or irritation where the medicine was injected; or

• hives.

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 concizumab if you are allergic to it.

Tell your doctor if you have or have ever had:

• a planned surgery;

• blood clots or any other blood clotting disorder; or

• conditions that increase risk of blood clots such as coronary artery disease (clogged arteries), cancer, crush injury, or sepsis (a severe reaction to an infection).

It is not known if concizumab will harm an unborn baby. You may need a pregnancy test to make sure you are not pregnant. Use effective birth control while using concizumab and for at least 7 weeks after your last dose. Tell your doctor if you become pregnant.

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

How should I use concizumab?

Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.

Concizumab is injected under the skin in the stomach or thigh, usually once a day. A healthcare provider may give you this injection or may teach you or your caregiver how to properly use this medicine by yourself.

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.

Do not reuse a needle. 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.

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.

Your blood may need to be tested often. Your doctor will need to check your progress on a regular basis.

Doses are based on weight. Your dose may change if you gain or lose weight.

Your doctor may tell you to use concizumab together with another medicine to help with bleeding episodes. Follow your doctor's dosing instructions very carefully.

Your condition may get worse if you stop using concizumab suddenly. Ask your doctor before stopping the medicine.

This medicine can affect the results of certain blood tests. Tell any doctor who treats you that you are using concizumab.

Tell your doctor if you have a planned surgery.

Store this medicine in the original carton in the refrigerator. Protect from light and do not freeze.

You may store a used prefilled pen in the refrigerator or at room temperature for up to 28 days. Throw the medicine away if not used within 28 days, even if there is still medicine left inside.

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 concizumab?

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

What other drugs will affect concizumab?

Using concizumab with other drugs that help treat your bleeding episodes may increase your risk of blood clots. Tell your doctor about any other medicines you use especially factor VIIa (rFVIIa) or activated prothrombin complex concentrate (aPCC).

Other drugs may affect concizumab, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

Concizumab Biosimilars

Biosimilar and interchangeable products are biological products that are highly similar to and have no clinically meaningful differences from the reference product.

Reference products

These are biological products that have already been approved by the FDA, against which biosimilar products are compared. There is 1 for concizumab.

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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