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Indication and Usage

Gamifant® (emapalumab-lzsg) is an IFNγ–blocking antibody indicated for the treatment of adult and pediatric (newborn and older) patients with primary hemophagocytic lymphohistiocytosis (HLH) with refractory, recurrent, or progressive disease or intolerance with conventional HLH therapy.

Indication and Usage

Gamifant® (emapalumab-lzsg) is an interferon gamma (IFNγ)–blocking antibody indicated for the treatment of adult and pediatric (newborn and older) patients with primary hemophagocytic lymphohistiocytosis (HLH) with refractory, recurrent, or progressive disease or intolerance with conventional HLH therapy.

Important Safety Information

Before initiating Gamifant, patients should be evaluated for infection, including latent tuberculosis (TB). Prophylaxis for TB should be administered to patients who are at risk for TB or known to have a positive purified protein derivative (PPD) test result or positive IFNγ release assay.

During Gamifant treatment, patients should be monitored for TB, adenovirus, Epstein-Barr virus (EBV), and cytomegalovirus (CMV) every 2 weeks and as clinically indicated.

Patients should be administered prophylaxis for herpes zoster, Pneumocystis jirovecii, and fungal infections prior to Gamifant administration.

Do not administer live or live attenuated vaccines to patients receiving Gamifant and for at least 4 weeks after the last dose of Gamifant. The safety of immunization with live vaccines during or following Gamifant therapy has not been studied.

Infusion-Related Reactions

Infusion-related reactions, including drug eruption, pyrexia, rash, erythema, and hyperhidrosis, were reported with Gamifant treatment in 27% of patients. In one-third of these patients, the infusion-related reaction occurred during the first infusion.

Adverse Reactions

In the pivotal trial, the most commonly reported adverse reactions (≥10%) for Gamifant included infection (56%), hypertension (41%), infusion-related reactions (27%), pyrexia (24%), hypokalemia (15%), constipation (15%), rash (12%), abdominal pain (12%), CMV infection (12%), diarrhea (12%), lymphocytosis (12%), cough (12%), irritability (12%), tachycardia (12%), and tachypnea (12%).

Additional selected adverse reactions (all grades) that were reported in less than 10% of patients treated with Gamifant included vomiting, acute kidney injury, asthenia, bradycardia, dyspnea, gastrointestinal hemorrhage, epistaxis, and peripheral edema.

Please see full Prescribing Information for Gamifant.

You may also contact Sobi at or 866-773-5274.


  1. Locatelli F, Jordan MB, Allen C, et al. Emapalumab in children with primary hemophagocytic lymphohistiocytosis. N Engl J Med. 2020;382(19):1811-1822.
  2. Sepulveda F, de Saint Basile G. Hemophagocytic syndrome: primary forms and predisposing conditions. Curr Opin Immunol. 2017; 49:20-26.
  3. Jordan MB, Allen CE, Weitzman S, Filipovich AH, McClain KL. How I treat hemophagocytic lymphohistiocytosis. Blood. 2011;118(15):4041-4052. doi:
  4. Lehmberg K, Nichols KE, Henter J-I, et al. Consensus recommendations for the diagnosis and management of hemophagocytic lymphohistiocytosis associated with malignancies. Haematologica. 2015:100(8):997-1004.
  5. Marsh RA, Haddad E. How I treat primary haemophagocytic lymphohistiocytosis. Br J Haematol. 2018;182(2):185-199. doi: 10.1111/bjh.15274.
  6. Gamifant [prescribing information]. Stockholm, Sweden: Swedish Orphan Biovitrum AB.

Select your vials

Gamifant is available in 10 mg/2 mL, 50 mg/10 mL, and 100 mg/20 mL vials. Please note that vials are single use only. Any remaining drug must be discarded.

Three Gamifant vial sizes

Administering GAMIFANT

Gamifant can be administered in a 20 mL or larger syringe or in a 0.9% sodium chloride for injection, USP infusion bag of appropriate size.

Note: Do not use with ethylene oxide–sterilized syringes.

Prepare the Gamifant dilution

Remove Gamifant from the refrigerator and inspect vials for particulate matter and discoloration. Gamifant should be clear to slightly opalescent, and colorless to slightly yellow. Do not use if it is discolored or if foreign particulate matter is present.

Withdraw the necessary amount of Gamifant solution and dilute with 0.9% sodium chloride injection, USP, to a maximum concentration of 2.5 mg/mL. Do not dilute product to less than 0.25 mg/mL.

Discard any unused portion left in the vial(s). Gamifant vials are for single use only.

Place the diluted solution in a syringe or infusion bag.


Gently invert the infusion bag or syringe several times to ensure complete and homogeneous distribution of Gamifant.



Once the infusion solution is prepared, it should clearly be labeled for administration to the patient.


Gamifant vial sizes and packaging
  • Administer Gamifant diluted solution over 1 hour through an intravenous line containing sterile, non-pyrogenic, low–protein binding 0.2 μm in-line filter
  • Do not store any unused portion of the infusion solution for reuse. Any unused product or waste material should be disposed of in accordance with local requirements
  • If you do not administer Gamifant immediately, download the Dosing and Administration Guide for storage information