What is severe neutropenia?

Chemotherapy works by stopping or slowing the growth of cancer cells, which grow and divide quickly. But it can also affect normal, healthy cells that are fast growing, too.

  • One type of healthy cell that is sometimes affected is called a neutrophil
  • Neutrophils are white blood cells that are important in fighting infection
  • Chemotherapy may reduce the number of healthy neutrophil cells
  • A low level of neutrophils is called severe neutropenia (nu-tro-PEEN-ee-ah)

If you have neutropenia or a low level of neutrophils, you may be at risk for infections. If your neutrophil level gets very low, you may get severe neutropenia.

Normal white blood cell count
Low white blood cell count

Symptoms of infection

If you are neutropenic, you may experience the symptoms below (some of which you might normally have with a cold or flu):

  • A fever greater than 100.4°F
  • Shaking or sweating chills
  • Sore throat or sores in your mouth
  • Cough
  • Shortness of breath
  • Burning with urination or frequent urination
  • Diarrhea
  • Skin changes
  • Redness, swelling, or drainage around an injury or an entry wound to the body such as a port or IV line

Blood tests

Your healthcare provider will test your blood before your chemotherapy and during treatment with GRANIX.

The doctor may want to keep track of your neutrophils with a test called an absolute neutrophil count (ANC).

  • Using the ranges you see here, your doctor can determine whether you have neutropenia and what your risk of infection is
  • The more severe your neutropenia, the higher your risk of infection
  • Your doctor will continue to test your blood until your white blood cell count returns to normal
Determining your risk of neutropenia and infection*†
1000-1500 Mild Low
500-1000 Moderate Moderate
Less than 500 Severe High

*National Comprehensive Cancer Network, Haematopoietic Growth Factors version 1.2022 Dec 2021.

National Neutropenia Network. Understanding Severe Chronic Neutropenia handbook. 2017.

Talk to your doctor about your test results.

Approved Use

GRANIX is a prescription medicine:

  • used in people with certain types of cancer (non-myeloid malignancies), who are receiving chemotherapy that affects the bone marrow
  • given to help decrease the length of time that the number of certain white blood cells (neutrophils) are very low (severe neutropenia). Neutrophils are white blood cells that are important in fighting bacterial infection
    It is not known if GRANIX is safe and effective in children younger than 1 month of age.

Important Safety Information

Do not take GRANIX if you have had a serious allergic reaction to filgrastim products or pegfligrastim products.

Before you receive GRANIX, tell your healthcare provider about all of your medical conditions, including if you:

  • have a sickle cell disorder
  • have kidney problems
  • plan to have bone scans or tests
  • are pregnant or plan to become pregnant. It is not known if GRANIX will harm your unborn baby. You should not become pregnant during treatment with GRANIX
  • are breastfeeding or plan to breastfeed. It is not known if GRANIX passes into your breast milk

Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.

What are the possible side effects of GRANIX?

GRANIX can cause serious side effects, including:

  • Spleen rupture. Your spleen may become enlarged and can rupture. A ruptured spleen can cause death. Call your healthcare provider right away if you have pain in your left upper stomach (abdomen)-area or your left shoulder during treatment with GRANIX.
  • A serious lung problem called acute respiratory distress syndrome (ARDS). Call your healthcare provider or get emergency medical help right away if you have shortness of breath with or without fever, trouble breathing, or a fast rate of breathing.
  • Serious allergic reactions. GRANIX can cause serious allergic reactions. These reactions can cause a rash over your whole body, shortness of breath, wheezing, dizziness, swelling around your mouth or eyes, fast heart rate, and sweating. If you have any of these symptoms, stop using GRANIX and call your healthcare provider or get emergency help right away.
  • Sickle cell crisis. You may have a serious sickle cell crisis, which could lead to death, if you have a sickle cell disorder and use GRANIX. Call your healthcare provider right away if you have symptoms of sickle cell crisis such as pain or difficulty breathing.
  • Kidney injury (glomerulonephritis). GRANIX can cause kidney injury. Call your healthcare provider right away if you develop any of the following symptoms:
    • swelling of your face or ankles
    • blood in your urine or dark colored urine
    • you urinate less than usual
  • Capillary Leak Syndrome. GRANIX can cause fluid to leak from blood vessels into your body’s tissues. This condition is called “Capillary Leak Syndrome” (CLS). CLS can quickly cause you to have symptoms that may become life-threatening. Get emergency medical help right away if you develop any of the following symptoms:
    • swelling or puffiness and are urinating less than usual
    • trouble breathing
    • swelling of your stomach-area (abdomen) and feeling of fullness
    • dizziness or feeling faint
    • a general feeling of tiredness
  • Inflammation of the aorta (aortitis). Inflammation of the aorta (the large blood vessel which transports blood from the heart to the body) has been reported in patients who received another filgrastim product. Symptoms may include fever, abdominal pain, feeling tired, and back pain. Call your healthcare provider if you experience these symptoms.
  • Your healthcare provider may decrease your dose, temporarily stop, or permanently stop treatment with GRANIX if you have certain side effects.
  • The most common side effect of GRANIX is bone pain.
  • Other possible side effects of other filgrastim products that may also happen with GRANIX may include muscle aches (myalgia), headache, weakness, diarrhea, fatigue, vomiting, inflamed blood vessels in the skin (cutaneous vasculitis), low platelet count (thrombocytopenia), and Sweet’s syndrome (a rare skin condition that mainly includes fever and painful skin lesions that appear mostly on the arms, neck, head and trunk).

These are not all of the possible side effects of GRANIX.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Click here to access the full Prescribing Information for GRANIX.