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Doctor measuring a patient's height and weight with caregiver
Committed to MPS II Care


Meet Antonio*

Medical history: Antonio is a 17-year-old male and, based on monitoring, has no apparent cognitive impairment

1 Year

Antonio had an umbilical hernia present within first months of life, confirmed at age.1


Antonio has repeat visits to the pediatrician due to multiple ear infections.1

2.8 Years

Antonio’s parents noticed his belly seems larger than other boys’, but they did not see it as unusual.1


The unresolved hernia was repaired by a pediatric surgeon.2

5 Years

A heart murmur was detected during an annual check-up.3 Antonio was referred to a cardiologist, who performed an echocardiogram that identified morphological changes in the mitral valve, but ultimately determined that no intervention, only monitoring, was required.4


Antonio’s behavior changed as he appears to be ignoring his teachers and parents. His doctor discovers he is experiencing progressive hearing loss, which was improved by hearing aid use.4,5

7 Years

Antonio experienced progressive joint stiffness that affected his walking capacity so that he often walked on his toes.3


The accumulating combination of symptoms led Antonio’s pediatrician to suspect a genetic condition. He referred him to a geneticist, who diagnosed Antonio with Hunter syndrome.

*These are hypothetical patient profiles intended to represent patients with MPS II. Individual signs and symptoms vary widely.

Elaprase is administered at a dose of 0.5 mg/kg body weight every week by intravenous infusion. Elaprase is supplied in 3 mL vials containing 2 mg/mL Elaprase.

Antonio post diagnosis

8 Years

Treatment with ELAPRASE was initiated. Antonio weighed 22 kg; therefore, he received an infusion of 11 mg ELAPRASE (1.8 vials of ELAPRASE) per week.

22 kg x (0.5 mg/kg)6 = 11 mg

11 mg ÷ (2 mg/mL) = 5.5 ml

5.5 mL ÷ (3 mL/vial) = 1.8 vials


Antonio's continued joint stiffness was compounded by carpel tunnel syndrome; intubation was challenging during release surgery.2

11 Years

Antonio starts noticeably falling behind other boys his age in height.5


Antonio’s complaints of sleeping poorly were discovered to be caused by worsening sleep apnea.3

15 Years

Antonio underwent spinal-fusion surgery under general anesthetic for scoliosis and kyphosis. He had to be seen by many specialists before being anesthetized due to upper airway obstruction.5


ELAPRASE is dosed according to weight,6 so Antonio is weighed regularly. He weighs 60 kg; therefore, his weekly ELAPRASE dose is 30 mg (5 vials).

60 kg x (0.5 mg/kg) = 30 mg

30 mg ÷ (2 mg/mL) = 15 mL

15 mL ÷ (3 mL/vial) = 5 vials

*These are hypothetical patient profiles intended to represent patients with MPS II. Individual signs and symptoms vary widely.

Elaprase is administered at a dose of 0.5 mg/kg body weight every week by intravenous infusion. Elaprase is supplied in 3 mL vials containing 2 mg/mL Elaprase.

Important Safety Information


Life-threatening anaphylactic reactions have occurred in some patients during and up to 24 hours after ELAPRASE infusions. Anaphylaxis, presenting as respiratory distress, hypoxia, hypotension, urticaria and/or angioedema of throat or tongue have been reported to occur during and after ELAPRASE infusions, regardless of duration of the course of treatment. Closely observe patients during and after ELAPRASE administration and be prepared to manage anaphylaxis. Inform patients of the signs and symptoms of anaphylaxis and have them seek immediate medical care should symptoms occur. Patients with compromised respiratory function or acute respiratory disease may be at risk of serious acute exacerbation of their respiratory compromise due to hypersensitivity reactions, and require additional monitoring.

Hypersensitivity Reactions Including Anaphylaxis:

Ensure that personnel administering product are adequately trained in cardiopulmonary resuscitative measures, and have ready access to emergency medical services (EMS).

If anaphylactic or other acute reactions occur, immediately discontinue the infusion of ELAPRASE and initiate appropriate medical treatment. Observe patients closely for an appropriate period of time after administration of ELAPRASE, taking into account the time to onset of anaphylaxis seen in premarketing clinical trials and postmarketing reports. Inform patients of the signs and symptoms of anaphylaxis, and instruct them to seek immediate medical care should signs and symptoms occur. When severe reactions have occurred during clinical trials, subsequent infusions were managed with antihistamine and/or corticosteroids prior to or during infusions, a slower rate of ELAPRASE infusion, and/or early discontinuation of the ELAPRASE infusion.

Risk of Hypersensitivity, Serious Adverse Reactions, and Antibody Development in Hunter Syndrome Patients with Severe Genetic Mutations:

Hunter syndrome patients aged 7 years and younger with complete gene deletion, large gene rearrangement, nonsense, frameshift or splice site mutations experienced a higher incidence of hypersensitivity reactions, serious adverse reactions and anti-idursulfase antibody development.

Risk of Acute Respiratory Complications:

Patients with compromised respiratory function or acute febrile or respiratory illness may be at higher risk of life-threatening complications from hypersensitivity reactions. Careful consideration should be given to the patient’s clinical status prior to administration of ELAPRASE and consider delaying the ELAPRASE infusion.

Risk of Acute Cardiorespiratory Failure:

Caution should be exercised when administering ELAPRASE to patients susceptible to fluid overload, or patients with acute underlying respiratory illness or compromised cardiac and/or respiratory function for whom fluid restriction is indicated. These patients may be at risk of serious exacerbation of their cardiac or respiratory status during infusions. Appropriate medical support and monitoring measures should be readily available during ELAPRASE infusion, and some patients may require prolonged observation times that should be based on the individual needs of the patient.

Adverse Reactions:

In clinical trials, the most frequent serious adverse reactions following ELAPRASE treatment were hypoxic episodes. Other notable serious adverse reactions that occurred in the ELAPRASE-treated patients but not in the placebo-treated patients included one case each of: cardiac arrhythmia, pulmonary embolism, cyanosis, respiratory failure, infection, and arthralgia.

The most common adverse reactions occurring in at least three patients (≥9%) aged five years and older were headache, pruritus, musculoskeletal pain, urticaria, diarrhea, and cough. The most common adverse reactions occurring in at least three patients (≥10%) aged seven years and younger were pyrexia, rash, vomiting, and urticaria. In all clinical trials, the most common adverse reactions requiring medical intervention were hypersensitivity reactions, and included rash, urticaria, pruritus, flushing, pyrexia, and headache.


In clinical trials in patients 5 years and older, 32 of 63 (51%) patients tested positive for anti-idursulfase IgG antibodies (Ab) at least one time. Of the 32 Ab-positive patients, 23 of 32 (72%) tested positive for Ab at three or more different time points (persistent Ab). The incidence of hypersensitivity reactions was higher in patients who tested positive for Ab than those who tested negative.

Thirteen of 32 (41%) Ab-positive patients also tested positive for antibodies that neutralize idursulfase uptake into cells (neutralizing antibodies, NAb) or enzymatic activity at least one time, and 8 (25%) of Ab-positive patients had persistent NAb. There was no clear relationship between the presence of either Ab or NAb and therapeutic response.

In the clinical trial in patients 7 years and younger, 19 of 28 (68%) patients treated with ELAPRASE 0.5 mg/kg once weekly tested Ab-positive, with 16 of 19 (84%) having persistent Ab. In addition, 15 of 19 (79%) Ab-positive patients tested positive for NAb, with 14 of 15 (93%) having persistent NAb.

Postmarketing Experience:

Late-emergent symptoms and signs of anaphylactic reactions have occurred up to 24 hours after initial treatment and recovery from an initial anaphylactic reaction. In addition, patients experienced repeated anaphylaxis over a 2- to 4-month period, up to several years after initiating ELAPRASE treatment.

Serious adverse reactions that resulted in death included cardiorespiratory arrest, respiratory failure, respiratory distress, cardiac failure, and pneumonia.

Indications and Usage

ELAPRASE® (Idursulfase) is indicated for patients with Hunter syndrome (Mucopolysaccharidosis II, MPS II). ELAPRASE has been shown to improve walking capacity in patients 5 years and older.

In patients 16 months to 5 years of age, no data are available to demonstrate improvement in disease-related symptoms or long term clinical outcome; however, treatment with ELAPRASE has reduced spleen volume similarly to that of adults and children 5 years of age and older.

The safety and efficacy of ELAPRASE have not been established in pediatric patients less than 16 months of age.