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Last Updated: 3/30/2026

Emapalumab-lzsg

Drug Name(s): Gamifant

Class: DMARDs

This medication is used to treat adults and children with macrophage activation syndrome in known or suspected cases of Still’s disease (including sJIA) that don’t respond adequately to corticosteroids.

Uses

macrophage activation syndrome (MAS) in Still’s disease, including systemic Juvenile Idiopathic Arthritis (sJIA), with inadequate response or intolerance to corticosteroids

Dosage

Form(s): injection, infusion 

Infusion: 6 mg/kg initial dose, followed by 3 mg/kg every 3 days for 5 doses, then 3 mg/kg up to 10mg/kg twice per week 

Injection: 5mg/mL up to 25mg/mL


Special Instructions

Your doctor will evaluate your risk of tuberculosis and may give you medication to prevent herpes zoster or other infections before starting this drug. 

Tell your doctor if you develop any signs of infection after receiving it. 

Gamifant is given by injection or infusion in a doctor’s office or other clinical facility. 


Potential Side Effects

Fever, rash, tingling feeling, headache

Be Aware

This drug raises your risk of developing infections, including herpes zoster, pneumonia or other bacterial, viral or fungal infections.  

Talk to your doctor before getting any live vaccines. 

Talk to your doctor if you are or may become pregnant or breast-feeding while taking this drug.


The Arthritis Foundation’s Drug Guide is meant for education — not self-medicating. The Arthritis Foundation does not endorse any products mentioned in this guide. While we endeavor to keep the information up to date, we make no representations or warranties about the completeness of the information provided. 
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