Indication

SYLVANT® (siltuximab) is indicated for the treatment of patients with Multicentric Castleman's Disease (MCD) who are human immunodeficiency virus (HIV) negative and human herpesvirus-8 (HHV-8) negative.

Limitation of Use. SYLVANT® was not studied in patients with MCD who are HIV-positive or HHV-8 positive because SYLVANT® did not bind to virally produced IL-6 in a nonclinical study.

Important Safety Information For SYLVANT®

CONTRAINDICATIONS – Severe hypersensitivity reaction to siltuximab or any of the excipients in SYLVANT®.

Concurrent Active Severe Infections – Do not administer to patients with severe infections until the infection resolves. SYLVANT® may mask signs and symptoms of acute inflammation including suppression of fever and of acute phase reactants such as C-reactive protein (CRP). Monitor patients closely for infections. Institute prompt anti-infective therapy and do not administer further SYLVANT® until the infection resolves.

Vaccinations – Do not administer live vaccines to patients receiving SYLVANT® because interleukin-6 (IL-6) inhibition may interfere with the normal immune response to new antigens.

Infusion Related Reactions and Hypersensitivity – Stop the infusion if the patient develops signs of anaphylaxis. Discontinue further therapy.

Stop the infusion if the patient develops mild to moderate infusion reactions. If the reaction resolves, the infusion may be restarted at a lower infusion rate. Consider medicating with antihistamines, acetaminophen, and corticosteroids. Discontinue SYLVANT® if the patient does not tolerate the infusion following these interventions.

Administer SYLVANT® in a setting that provides resuscitation equipment, medication, and personnel trained to provide resuscitation.

Gastrointestinal (GI) Perforation – Use with caution in patients who may be at increased risk for GI perforation. Promptly evaluate patients presenting with symptoms that may be associated with or suggestive of GI perforation.

Adverse Reactions – The most common adverse reactions (>10% compared to placebo) in the MCD clinical trial were pruritus, increased weight, rash, hyperuricemia, and upper respiratory tract infection.

Drug Interactions Cytochrome P450 (CYP450) Substrates – Upon initiation or discontinuation of SYLVANT®, in patients being treated with CYP450 substrates with narrow therapeutic index, perform therapeutic monitoring of effect (e.g., warfarin) or drug concentration (e.g., cyclosporine or theophylline) as needed and adjust dose. Exercise caution when SYLVANT® is co-administered with CYP3A4 substrate drugs where a decrease in effectiveness would be undesirable (e.g., oral contraceptives, lovastatin, atorvastatin).

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