Sylvant: Uses, Side Effects & Warnings

Generic name: siltuximab [ sil-tux-i-mab ]

Drug class: Interleukin inhibitors

Dosage form: injection, powder, lyophilized, for solution

Availability: Prescription only

Pregnancy & Lactation: Risk data available

Brand names: Siltuximab

What is Sylvant?

Sylvant inhibits a certain protein in the body called interleukin-6 (IL-6). High levels of IL-6 can cause an overgrowth of cells in the lymph system (part of your immune system).

Sylvant is used to treat Multicentric Castleman's Disease (MCD). MCD is a rare condition in which the body produces too much of a certain type of white blood cell. MCD can increase your risk of certain cancers by changing the way your immune system works.

Sylvant is not for use in people who have human immunodeficiency virus (HIV) or human herpesvirus-8.

Warnings

You should not use Sylvant if you have a severe infection. Tell your doctor if you have recently had any signs of infection (fever, chills, body aches).

Before taking this medicine

You should not be treated with Sylvant if you are allergic to siltuximab, or if you have a severe infection.

If you have a severe illness with fever or any type of infection, you may need to wait until you get better before receiving this medicine. Tell your doctor if you have recently had any signs of infection (fever, chills, body aches).

To make sure Sylvant is safe for you, tell your doctor if you have ever had:

  • a chronic infection;

  • a stomach or intestinal disorder, including ulcer or diverticulitis;

  • stomach or intestinal bleeding;

  • gout; or

  • if you have recently received any vaccines, or if you are due to receive one.

Sylvant may harm an unborn baby. Siltuximab an affect the immune system of a newborn if the mother receives the medicine during pregnancy. Uee effective birth control to prevent pregnancy while you are using this medicine and for at least 3 months after your last dose.

You should not breast-feed while using this medicine.

Sylvant pregnancy and breastfeeding warnings (more detail)

How should I take Sylvant

Sylvant is given as an infusion into a vein, usually once every 3 weeks. A healthcare provider will give you this injection. Follow your doctor's dosing instructions very carefully.

Before each injection, your doctor may perform blood tests to make sure you do not have conditions that would prevent you from safely using Sylvant.

Siltuximab can increase your risk of bleeding or infection. You will need frequent medical tests. Your treatments may be delayed based on the results.

Sylvant must be given slowly and the IV infusion can take at least 1 hour to complete.

Siltuximab can lower blood cells that help your body fight infections. Your blood will need to be tested often. Your treatments may be delayed based on the results of these tests.

Dosing information

Usual Adult Dose for Castleman's Disease:

11 mg/kg intravenously over 1 hour every 3 weeks.

Duration of therapy: Until treatment failure.

Comments:
-Siltuximab was not studied in patients with MCD who are HIV positive or HHV-8 positive because siltuximab did not bind to virally produced IL-6 in a nonclinical study.


Use: Treatment of patients with multicentric Castleman's disease (MCD) who are human immunodeficiency virus (HIV) negative and human herpesvirus-8 (HHV-8) negative.

Detailed Sylvant dosage information
Sylvant Dosage information (more detail)

Before Taking

You should not be treated with Sylvant if you are allergic to siltuximab, or if you have a severe infection.

If you have a severe illness with fever or any type of infection, you may need to wait until you get better before receiving this medicine. Tell your doctor if you have recently had any signs of infection (fever, chills, body aches).

To make sure Sylvant is safe for you, tell your doctor if you have ever had:

  • a chronic infection;

  • a stomach or intestinal disorder, including ulcer or diverticulitis;

  • stomach or intestinal bleeding;

  • gout; or

  • if you have recently received any vaccines, or if you are due to receive one.

Sylvant may harm an unborn baby. Siltuximab an affect the immune system of a newborn if the mother receives the medicine during pregnancy. Uee effective birth control to prevent pregnancy while you are using this medicine and for at least 3 months after your last dose.

You should not breast-feed while using this medicine.

Sylvant pregnancy and breastfeeding warnings (more detail)

Related/similar drugs

siltuximab

What happens if I miss a dose?

Call your doctor for instructions if you miss an appointment for your Sylvant injection.

What happens if I overdose?

Since this medicine is given by a healthcare professional in a medical setting, an overdose is unlikely to occur.

What should I avoid while using Sylvant?

Do not receive a "live" vaccine while using Sylvant. The vaccine may not work as well and may not fully protect you from disease. Live vaccines include measles, mumps, rubella (MMR), polio, rotavirus, typhoid, yellow fever, varicella (chickenpox), zoster (shingles), and nasal flu (influenza) vaccine.

Sylvant side effects

Get emergency medical help if you have any signs of an allergic reaction to Sylvant: hives; chest tightness, difficult breathing; swelling of your face, lips, tongue, or throat.

Some side effects may occur during the injection. Tell your caregiver right away if you feel nauseated, or have back pain, warmth or redness under your skin, chest pain, pounding heartbeats, fluttering in your chest, or swelling in your face.

Call your doctor at once if you have:

  • bloody or tarry stools, cough with bloody mucus or vomit that looks like coffee grounds;

  • signs of infection, such as fever, chills, painful mouth sores, pain when swallowing, cold or flu symptoms, cough, trouble breathing; or

  • signs of a kidney problem - little or no urination; painful or difficult urination; swelling in your feet or ankles; severe pain in your side or lower back.

Common Sylvant side effects may include:

  • weight gain;

  • itching or rash;

  • cold symptoms such as stuffy nose, sneezing, sore throat; or

  • high levels of uric acid in your blood (can lead to kidney problems or gout symptoms such as joint stiffness, pain, or swelling).

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.

See more: Sylvant Side Effects

What other drugs will affect Sylvant?

Other drugs may interact with siltuximab, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell each of your health care providers about all medicines you use now and any medicine you start or stop using.

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