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Medications and Drugs

Brand Names: Neupogen, Neupogen SingleJect

Generic Name: filgrastim (Pronunciation: fil GRAS tim)

What is filgrastim (Neupogen, Neupogen SingleJect)?

Filgrastim is a man-made form of a protein that stimulates the growth of white blood cells in your body. White blood cells help your body fight against infection.

Filgrastim is used to treat neutropenia, a lack of certain white blood cells caused by cancer, bone marrow transplant, receiving chemotherapy, or by other conditions.

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

What are the possible side effects of filgrastim (Neupogen, Neupogen SingleJect)?

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

  • sudden or severe pain in your left upper stomach spreading up to your shoulder;
  • rapid breathing or feeling short of breath; or
  • signs of infection such as fever, chills, sore throat, flu symptoms, easy bruising or bleeding (nosebleeds, bleeding gums), loss of appetite, nausea and vomiting, mouth sores, unusual weakness.

Less serious side effects may include:

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 filgrastim (Neupogen, Neupogen SingleJect)?

You should not use this medication if you are allergic to filgrastim or to other medicines that contain the E. coli bacteria.

Before using filgrastim, tell your doctor if you have a blood cell disorder (such as sickle cell anemia), chronic myeloid leukemia, myelodysplasia (also called "preleukemia"), or if you are receiving chemotherapy or radiation treatment.

Do not self-inject this medicine if you do not fully understand how to give the injection and properly dispose of used needles, syringes, IV tubing, and other items used to inject the medicine.

To be sure this medication is helping your condition, your blood may need to be tested often. This will help your doctor determine how long to treat you with filgrastim. Your liver function will also need to be tested, and you may need bone density scans. Visit your doctor regularly.

Stop using filgrastim and call your doctor at once if you have a serious side effect such as sudden or severe pain in your left upper stomach spreading up to your shoulder, rapid breathing or feeling short of breath, or signs of infection (fever, chills, sore throat, flu symptoms, easy bruising or bleeding, loss of appetite, nausea and vomiting, mouth sores, or unusual weakness).



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

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Use the pill finder tool on RxList.



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