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ROPEGINTERFERON ALFA-2B (ROE peg IN ter FEER on al fa 2b) treats blood and bone marrow cancers. It works by slowing down the growth of cancer cells.
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Cleveland Clinic is a non-profit academic medical center. Advertising on our site helps support our mission. We do not endorse non-Cleveland Clinic products or services. Policy
This medicine may be used for other purposes; ask your health care provider or pharmacist if you have questions.
COMMON BRAND NAME(S): BESREMi
They need to know if you have any of these conditions:
This medication is injected under the skin. It is usually given by your care team in a hospital or clinic setting. It may also be given at home.
If you get this medication at home, you will be taught how to prepare and give it. Use exactly as directed. Take it as directed on the prescription label at the same time every day. Keep taking it unless your care team tells you to stop.
It is important that you put your used needles and syringes in a special sharps container. Do not put them in a trash can. If you do not have a sharps container, call your pharmacist or care team to get one.
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A special MedGuide will be given to you by the pharmacist with each prescription and refill. Be sure to read this information carefully each time.
This medication comes with INSTRUCTIONS FOR USE. Ask your pharmacist for directions on how to use this medication. Read the information carefully. Talk to your pharmacist or care team if you have questions.
Talk to your care team about the use of this medication in children. Special care may be needed.
Overdosage: If you think you have taken too much of this medicine contact a poison control center or emergency room at once.
NOTE: This medicine is only for you. Do not share this medicine with others.
If you get this medication at the hospital or clinic: It is important not to miss your dose. Call your care team if you are unable to keep an appointment.
If you give yourself this medication at home: If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses. Call your care team with questions.
This list may not describe all possible interactions. Give your health care provider a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with your medicine.
Visit your care team for regular checks on your progress. It may be some time before you see the benefit from this medication. You may need blood work while taking this medication.
This medication may cause thoughts of suicide or depression. This includes sudden changes in mood, behaviors, or thoughts. These changes can happen at any time but are more common in the beginning of treatment or after a change in dose. Call your care team right away if you experience these thoughts or worsening depression.
This medication may affect your coordination, reaction time, or judgment. Do not drive or operate machinery until you know how this medication affects you. Sit up or stand slowly to reduce the risk of dizzy or fainting spells. Drinking alcohol with this medication can increase the risk of these side effects.
If you have hepatitis B, talk to your care team if you plan to stop this medication. The symptoms of hepatitis B may get worse if you stop this medication.
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Your vision may be tested before and during use of this medication. Tell your care team right away if you have any change in your eyesight.
This medication can cause tooth and gum problems. Tenderness, swelling, or minor bleeding of the gums may occur. Brushing and flossing your teeth regularly may reduce the risk of side effects. Visit your dentist on a regular basis. Tell your dentist about any medications you are taking.
This medication may increase your risk of getting an infection. Call your care team for advice if you get a fever, chills, sore throat, or other symptoms of a cold or flu. Do not treat yourself. Try to avoid being around people who are sick.
Talk to your care team if you may be pregnant. Serious birth defects can occur if you take this medication during pregnancy and for 8 weeks after the last dose. You will need a negative pregnancy test before starting this medication. Contraception is recommended while taking this medication and for 8 weeks after the last dose. Your care team can help you find the option that works for you.
Do not breastfeed while taking this medication and for 8 weeks after the last dose.
Side effects that you should report to your care team as soon as possible:
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Side effects that usually do not require medical attention (report to your care team if they continue or are bothersome):
This list may not describe all possible side effects. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
Keep out of the reach of children and pets.
Store in the refrigerator. Do not freeze. Keep it in the original carton until you are ready to take it. Remove the dose from the carton about 30 minutes before it is time for you to take it. Avoid exposure to extreme heat. Get rid of any unused medication after the expiration date.
To get rid of medications that are no longer needed or have expired:
NOTE: This sheet is a summary. It may not cover all possible information. If you have questions about this medicine, talk to your doctor, pharmacist, or health care provider.
Copyright ©2026 Elsevier Inc. All Rights Reserved.
Note: Introduction and Additional Common Questions written and medically approved by Cleveland Clinic professionals.