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Generic name: tbo-filgrastim
Drug class: Colony stimulating factors

Medically reviewed by  A Ras MD.

What is Granix used for?

Granix is a prescription medicine that is used to lower the chance of getting an infection in people with bone marrow problems caused by chemo. It is used to raise the number of white blood cells in certain patients. Granix may be given to you for other reasons.


GRANIX (tbo-filgrastim) is a non-glycosylated recombinant methionyl human granulocyte colony-stimulating growth factor (r-metHuG-CSF) manufactured by recombinant DNA technology using the bacterium strain E coli K802. It has a molecular weight of approximately 18.8 kDa and is composed of 175 amino acids. The endogenous human G-CSF is glycosylated and does not have the additional methionine amino acid residue in its NH2 terminal end.

The product is a sterile, clear, colorless, preservative-free solution containing tbo-filgrastim, glacial acetic acid, sorbitol, polysorbate 80, sodium hydroxide, and Water for Injection.  The product is available in single-dose prefilled syringes that contain either 300 mcg or 480 mcg of tbo-filgrastim at a fill volume of 0.5 mL or 0.8 mL, respectively and single-dose vials that contain either 300 mcg or 480 mcg of tbo-filgrastim at a fill volume of 1 mL or 1.6 mL, respectively. See table below for product composition of each presentation.

Product Composition

300 mcg/0.5 mL         Syringe

480 mcg/0.8 mL   Syringe

300 mcg/1mL

480 mcg/1.6 mL


300 mcg

480 mcg

 300 mcg  480 mcg

Glacial Acetic Acid

0.3 mg

0.48 mg

 0.6 mg 0.96 mg 

Polysorbate 80

0.0275 mg

0.044 mg

 0.055 mg 0.088 mg 


25 mg

40 mg

 50 mg  80 mg

Sodium Hydroxide

q.s. to pH 4.2

q.s. to pH 4.2

q.s. to pH 4.2 q.s. to pH 4.2

Water for Injection

q.s. to 0.5 mL

q.s. to 0.8 mL

q.s. to 1.0 mL q.s. to 1.6 mL
q.s. = quantity sufficient to make

Mechanism of Action

Tbo-filgrastim is a human granulocyte colony-stimulating factor (G-CSF) produced by recombinant DNA technology. Tbo-filgrastim binds to G-CSF receptors and stimulates proliferation of neutrophils. G-CSF is known to stimulate differentiation commitment and some end-cell functional activation, which increases neutrophil counts and activity.

Before taking Granix, tell your doctor:

  • If you are allergic to Granix; any part of this medicine; or any other drugs, foods, or substances. Tell your doctor about the allergy and what signs you had.

This medicine may interact with other drugs or health problems.

Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take Granix with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.

What are some things I need to know or do while I take Granix?

  • Tell all of your health care providers that you take Granix. This includes your doctors, nurses, pharmacists, and dentists.
  • Do not get Granix at the same time or within 24 hours before or after chemo or radiation treatment. Talk with your doctor.
  • Have blood work checked as you have been told by the doctor. Talk with the doctor.
  • This medicine may affect certain lab tests. Tell all of your health care providers and lab workers that you take Granix.
  • This medicine may cause a severe and sometimes deadly problem called capillary leak syndrome (CLS). CLS may lead to low blood pressure, abnormal heartbeat, chest pain, or heart attack. It may also lead to lung or breathing problems, bleeding or lower blood flow in the stomach or bowel, kidney problems, swelling, or feeling confused. If you have questions, talk with the doctor.
  • Some people with sickle cell disease have had times where the sickle cell disease has gotten worse when taking Granix. Sometimes, this has been deadly. Talk with the doctor.
  • Tell your doctor if you are pregnant, plan on getting pregnant, or are breast-feeding. You will need to talk about the benefits and risks to you and the baby.

How is Granix best taken?

Use Granix as ordered by your doctor. Read all information given to you. Follow all instructions closely.

  • It is given as a shot into the fatty part of the skin.
  • Keep taking Granix as you have been told by your doctor or other health care provider, even if you feel well.
  • If you will be giving yourself the shot, your doctor or nurse will teach you how to give the shot.
  • Before using Granix, take it out of the refrigerator and leave it at room temperature for 30 minutes.
  • Do not use if the solution is cloudy, leaking, or has particles.
  • Do not use if solution changes color.
  • Do not shake the solution.
  • Wash your hands before and after you give the shot.
  • Do not give into skin that is irritated, tender, bruised, red, scaly, hard, scarred, or has stretch marks.
  • Move the site where you give the shot with each shot.
  • Throw away any part left over after the dose is given.
  • Throw syringe away after use. Do not use the same syringe more than one time.
  • Throw away needles in a needle/sharp disposal box. Do not reuse needles or other items. When the box is full, follow all local rules for getting rid of it. Talk with a doctor or pharmacist if you have any questions.
  • If you get Granix on the skin, wash it off right away with soap and water.
  • If you get Granix in the eyes, flush right away with cool water and get medical help.

What do I do if I miss a dose?

  • Call your doctor to find out what to do.

What are the side effects of Granix that I need to call my doctor about immediately?

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

  • Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
  • Signs of kidney problems like unable to pass urine, change in how much urine is passed, blood in the urine, or a big weight gain.
  • Signs of lung or breathing problems like shortness of breath or other trouble breathing, cough, or fever.
  • Dark urine.
  • Chest pain or pressure or a fast heartbeat.
  • Dizziness or passing out.
  • Sweating a lot.
  • Fast breathing.
  • Coughing up blood.
  • Any unexplained bruising or bleeding.
  • Purple spots or redness of the skin.
  • Swelling.
  • Numbness or tingling.
  • Enlarged and ruptured spleens have happened with Granix. Sometimes, ruptured spleens have been deadly. Call your doctor right away if you have left upper stomach pain or left shoulder pain.
  • Swelling of the main blood vessel that comes out of the heart (aorta) has happened with Granix. Call your doctor right away if you feel very tired or weak. Call your doctor if you have fever, stomach pain, or back pain.

What are some other side effects of Granix?

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

  • Bone, joint, or muscle pain.
  • Headache.
  • Upset stomach or throwing up.
  • Feeling tired or weak.
  • Diarrhea.
  • Hair loss.

These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.

You may report side effects to the FDA at 1-800-332-1088. You may also report side effects at https://www.fda.gov/medwatch.

If overdose is suspected:

If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

How do I store and/or throw out Granix?

  • Store in a refrigerator. Do not freeze.
  • Store in the original container to protect from light.
  • If needed, Granix can be left out at room temperature for up to 5 days. If not used within 5 days of being left out at room temperature, you can return Granix to the refrigerator. Do not do this more than 1 time.
  • Throw away unopened drug if left at room temperature for more than 5 days.
  • Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
  • Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.



  • NDC 63459-918-59
  • 10 x 300 mcg/mL Single-Dose Vials (containing 1 mL)
  • Granix (tbo-filgrastim) Injection
  • 300 mcg/mL
  • For Subcutaneous Use Only.
  • A recombinant Granulocyte Colony-Stimulating Factor (rG-CSF) derived from E. coli. Discard unused portion.
  • Rx Only
  • Teva


Granix 10ct Vial Carton 300mcg/mL



  • NDC 63459-920-59
  • 10 x 480 mcg/1.6 mL Single-Dose Vials
  • Granix (tbo-filgrastim) Injection
  • 480 mcg/ 1.6mL
  • For Subcutaneous Use Only. A recombinant Granulocyte Colony-Stimulating Factor (rG-CSF) derived from E. coli. Discard unused portion.
  • Rx Only
  • Teva


Granix 10ct Vial Carton 480mcg/1.6mL





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