Download the pdf document here: Omalizumab Recommendation Version 2
Omalizumab (Xolair) is indicated as an add-on therapy for severe allergic asthma. In children aged 6 to <12 years, omalizumab is indicated as an add-on therapy to improve asthma control in patients with severe allergic asthma, who have documented exacerbations despite daily high-dose ICS and with IgE levels in the recommended dose range. In adults and adolescents ≥12 years of age, omalizumab is indicated for the management of patients with moderate to severe allergic asthma, who are already being treated with maximal recommended asthma therapy, and who have serum IgE levels (≥ 30 IU/mL) and positive allergen-specific IgE
Omalizumab is a recombinant, DNA-derived, humanised, monoclonal IgG1 antibody directed against immunoglobulin E (IgE). IgE is produced by the immune system and is involved in activation of immune responses during allergy.
Omalizumab binds to free human IgE in the blood and interstitial tissues, as well as to receptor-bound IgE on immune cells. The binding of omalizumab blocks “cross-linking” of IgE receptors on immune cells, and prevents allergic activation of these cells. This process reduces allergic responses and recruitment of immune cells into tissues.
Following single, subcutaneous administration, omalizumab reaches peak serum concentrations after around 6-10 days. In clinical trials, free IgE levels are reduced in a dose-dependent manner within 2 hours of subcutaneous dosing. Average decreases were 84-99% of baseline. Serum total IgE levels increased an average of 4-fold post-dosing due to formation of omalizumab-IgE binding complexes. Following discontinuation of omalizumab dosing, increases in total IgE and decreases in free IgE were reversible. [Content extracted from Xolair Production Information document]
In a meta-analysis, exacerbation frequency was reduced, with an odds ratio of 0.55 (95% CI; 0.46-0.65)(1). The absolute reduction in risk of exacerbations fell from 26% to 16%. Hospitalisations were also reduced (OR: 0.16; 95%C CI: 0.06-0.42). In addition, more patients were able to reduce ICS treatment. No significant reduction in OCS was observed.
In Australia, omalizumab can only be prescribed by a respiratory physician or allergist via S100 Authority prescription in accordance with specific application criteria. After discussing the risks, benefits, and alternatives to omalizumab, patients must complete the acknowledgement of understanding using the PBS initial application form. Patients require review of omalizumab efficacy and safety, by the prescribing respiratory physician, at 22 to 26 weeks after the first dose. For second and subsequent courses, the assessment should be undertaken after 18 to 22 weeks of treatment. Omalizumab is considered a high-risk medicine and must be administered with an independent second person check.
|Age ≥ 12 years (see separate eligibility criteria for children 6 to <12 years – https://www.humanservices.gov.au/health-professionals/forms/pb188)
|Asthma diagnosis confirmed by doctor and with at least a documented 1 year history
|Under the care of the same respiratory physician for 12 months
|Confirmed variable airflow limitation (1 or more of the following):
a. FEV1 reversibility ≥ 12% and ≥ 200mL at baseline within 30 minutes after administration of salbutamol (200-400mg),
b. Airway hyper-responsiveness (AHR) defined as >20% decline in FEV1 during a direct bronchial provocation test or >15% decline during an indirect test,
c. Peak Expiratory Flow (PEF) variability of >15% between the 2 highest and 2 lowest peak expiratory flow rates during 14 days
|FEV1 ≤ 80% predicted documented on one or more occasions in the last 12 months
|Past or current evidence of atopy, documented by skin prick testing or RAST
|Total serum human IgE greater than or equal to 30 IU/mL, no more than 12 months before application
|The patient has received optimised asthma therapy including adherence to high dose inhaled corticosteroid (ICS) and long-acting beta-2 agonist (LABA) for at least 12 months and treatment with oral corticosteroids (OCS) (either as daily OCS for at least 6 weeks or a cumulative dose of oral corticosteroids of ≥ 500mg prednisolone equivalent in the previous 12 months.
|The patient/guardian must sign the application indicating they understand and acknowledge that the PBS-subsidised treatment will cease if they do not meet a predetermined response criteria for ongoing PBS-subsidised treatment
|Failed to achieve adequate control with optimised asthma therapy, despite formal assessment of and adherence to correct inhaler technique, which as been documented|
|Must not receive more than 28 weeks of treatment (further treatment requires continuation form submission see below)
|The treatment must not be used in combination with, or within 6 months of treatment with, PBS-subsidised Mepolizumab
|Ongoing uncontrolled asthma, as defined by:
a. Asthma Control Questionnaire (ACQ-5) score ≥2 in the previous month AND
b. One of the following experienced in the previous year:
i. ≥1 admission to hospital for a severe asthma exacerbation, OR
ii. ≥1 severe asthma exacerbation requiring documented use of systemic corticosteroids (OCS initiated or increased for at least 3 days, or parenteral corticosteroids) prescribed/supervised by a physician.
Omalizumab therapy is generally well tolerated, but there are some safety considerations, the most important of which is the rare, but potentially life-threatening omalizumab-associated anaphylaxis. Despite these concerns, omalizumab has been safely administered in the community setting in Australia and internationally.
Adverse reactions with omalizumab were observed (all studies with adult and adolescent patients 12 years of age and older) at a frequency of 6.6 % of patients, treated with active drug, during clinical trials [extracted from Xolair Product Information document].
The most commonly associated adverse drug reactions were injection site reactions, including injection site pain, swelling, itching and redness (1.7%) and headaches (1%). Other adverse reactions most frequently observed were weight increase (0.7%), urticaria (0.4%), fatigue, arm swelling, nausea, pharyngitis and skin rashes (all at 0.3%). Most of these events were mild or moderate in severity [extracted from Xolair Product Information document].
In clinical trials with patients 6 to <12 years of age, the most commonly reported adverse reactions were headache, pyrexia and upper abdominal pain. Most of the events were mild or moderate in severity.
The incidence of anaphylaxis associated with post-marketing use of omalizumab may be as high as 0.2% though other researchers have found the incidence to be much lower at 0.09% (2). The anaphylaxis risk requires this medication to be administered in a clinical setting that has access to trained health professionals with equipment and medications to treat anaphylaxis and cardiac arrest.
Contraindications: Hypersensitivity to omalizumab or any other component of the formulation.
Asthma-related adverse events or exacerbations may occur during treatment with omalizumab. Patients should be instructed to seek medical advice if their asthma remains uncontrolled or worsens after initiation of treatment with omalizumab.
Abrupt discontinuation of asthma medication after initiation of omalizumab therapy is not recommended. Reductions in medication doses, if warranted, should be gradual and performed under the supervision of a physician.
Local or systemic allergic reactions, including anaphylaxis, may occur. In post-marketing experience, anaphylaxis reactions have been reported following the first and subsequent omalizumab administrations. Although most of these reactions occurred with 2 hours after administration, some occurred beyond 2 or even 24 hours after injection. Medications for the treatment of anaphylactic reactions should always be available for immediate use following omalizumab administration. Patients should be informed that such reactions are possible and prompt medical attention should be sought if allergic reactions do occur.
Serum sickness and serum sickness-like reactions, which are delayed allergic type III reactions, have rarely been seen in patients treated with humanized monoclonal antibodies including omalizumab. The onset has typically been 1-5 days after administration of the first or subsequent injections, also after long duration of treatment. Symptoms suggestive of serum sickness include arthritis/arthralgia, rash (urticaria or other forms), fever and lymphadenopathy. Patients should be advised to report any suspected symptoms.
Patients with severe asthma may rarely present systemic hypereosinophilic syndrome or allergic eosinophilic granulomatous vasculitis (Churg-Strauss syndrome), both of which are usually treated with systemic corticosteroids. In rare cases, patients on therapy with anti-asthma agents, including omalizumab, may present or develop systemic eosinophilia and vasculitis. A causal association between omalizumab and these underlying conditions has not been established. These events are commonly associated with the reduction of oral corticosteroid therapy. In these patients, clinicians should be alert to the development of marked eosinophilia, vasculitic rash, worsening pulmonary symptoms, paranasal sinus abnormalities, cardiac complications, and/or neuropathy. Discontinuation of omalizumab should be considered in all severe cases with the above-mentioned immune system disorders.
Omalizumab has not been studied in patients with anaphylaxis, hyperimmunoglobulin E syndrome, allergic bronchopulmonary aspergillosis, food allergy or atopic dermatitis. Parasitic infestation may also result in elevation of serum IgE concentrations. In a study of patients with asthma who had been treated for gut parasites, the level of reinfection did not differ significantly between omalizumab and placebo groups and there were no serious or severe infections (3). There is no current evidence to suggest that parasitic infections are predisposed to by omalizumab.
Patients treated with omalizumab have a rapid reduction in free IgE in the serum but an overall increase in the total serum IgE (commonly measured in clinical laboratories), which reflects free IgE and IgE bound by omalizumab. IgE measured following treatment cannot be used to guide treatment or dosing decisions.
Because omalizumab reduces free IgE in the serum and tissues, results of skin prick testing, patch testing, and RAST testing for hypersensitivity to potential allergens may be affected. A positive test to a potential allergen in a patient receiving omalizumab can be correctly interpreted as representing hypersensitivity to that allergen; however, a negative test in a patient receiving omalizumab may not be interpretable. Physicians are urged to use caution in interpreting such tests in patients receiving omalizumab.
At serum concentrations in excess of maximum human exposure used in pivotal clinical trials, dose-related thrombocytopenia occurred in 2 out of 4 non-human primate species studied. The thrombocytopenia was more pronounced in juvenile animals. No omalizumab-related thrombocytopenia has been observed in clinical trials, but it has been reported in the post-market setting.
Omalizumab should be used with caution in patients with thrombocytopenia and patients with a history of thrombocytopenia. It is recommended that patients have a platelet count before commencing therapy with omalizumab and then periodically during treatment with omalizumab.
The removable needle cap of omalizumab solution for injection in pre-filled syringe contains a derivative of natural rubber latex. Although no natural rubber latex is detected in the removable needle cap, the safe use of omalizumab solution for injection in pre-filled syringe in latex-sensitive individuals has not been studied.
No studies have been performed in pregnant or breast-feeding women. Studies in cynomolgus monkeys do not indicate direct or indirect harmful effects with respect to pregnancy, embryonic/fetal development, parturition or neonatal growth at weekly doses up to 75 mg/kg SC about 10 times the maximum anticipated clinical exposure in adult patients, based on serum AUC). Because immunoglobulins are known to cross the placenta and the potential for harm to the foetus is unknown, caution should be exercised when prescribing Xolair to pregnant women.
It is not known whether omalizumab is excreted in human milk. Because human IgG is excreted in human milk, and because the potential for absorption and harm to the infant are unknown, caution should be exercised when omalizumab is administered to breast-feeding women.
In order to assess the effect of omalizumab on late gestation, and to evaluate the placental transfer and milk excretion of omalizumab, doses of 75 mg/kg/week were administered subcutaneously to female cynomolgus monkeys. Transport of omalizumab into maternal milk was limited. The serum levels of omalizumab observed in dams, fetuses, and neonates are consistent with reported transport and distribution of IgG class immunoglobulins.
Omalizumab dosing is determined based on a matrix of baseline IgE levels and body weight, administered by subcutaneous injection every two or four weeks.
Dosing tables are available in the Xolair product information document, available at the following link (accessed 06 December 2017; document updated 30 March 2017):
Doses greater than 750 mg were not studied in the pivotal clinical trials. However, observational studies provide evidence for the effectiveness of a ceiling dose of omalizumab (750 mg) in individuals above the recommended dosing criteria (4).
Omalizumab is stored with the syringe sealed in its outer box in the refrigerator between 2°C and 8°C. DO NOT FREEZE.
This medication should be stored in the refrigerator but needs to be administered at room temperature necessitating removal from refrigeration at least 20 minutes prior to injection.
For pre-filled syringes, the product may be kept out of the refrigerator, for a total of 4 hours at 25°C. If necessary, the product may be returned to the refrigerator for later use, but this must not be done more than once.
The patient should remain for two hours after the first 3 omalizumab injections, and 30 minutes thereafter, in an area under direct staff observation
Omalizumab should be administered by a registered health care professional (physician or registered nurse). Monitoring of patients after administration of biological agents is recommended.
Initial treatment forms for paediatric patients can be downloaded at:
Initial treatment forms for adolescent and adult patients can be downloaded at: https://www.humanservices.gov.au/health-professionals/forms/pb075
Online through Health Professional Online Services (HPOS) at humanservices.gov.au/hpos
Department of Human Services Complex Drugs Programs Reply Paid 9826 HOBART TAS 7001
An assessment of the patient’s current asthma and general health should be made before each injection to determine whether there were any recent health changes that might require withholding treatment. This assessment should include vital signs, exacerbation history and spirometry.
Figure 3: Xolair pre-filled syringe
Figure 4: Dose & expiry window
Figure 5: Fill line
Figure 6: Needle withdrawal Figure 7: Auto-shield activation
The patient must be observed directly by a suitably qualified clinician administering the injection for at least two hours after each of the first 3 doses and 30 minutes thereafter, looking for adverse effects from the medication.
All applications for continuing treatment must include a measurement of response to the prior course of therapy. The assessment of the patient’s response to an initial course of treatment must be made at around 22 to 26 weeks after the first dose. For second and subsequent treatment courses, the assessment must be made around 18 to 22 weeks of treatment.
The same physician who initiated treatment with omalizumab should also complete the application for the first assessment. Continuing applications must include an ACQ5 calculation sheet.
An adequate response to treatment is defined as:
This assessment, which will be used to determine eligibility for continuing treatment, must be submitted within 4 weeks of the date of assessment, and no later than 2 weeks prior to the patient completing their current treatment course, to avoid an interruption to supply.
Continuation forms can be downloaded at:
Adolescent and adult:
Professor Vanessa McDonald – Centre of Excellence in Severe Asthma
Professor Peter Gibson – Centre of Excellence in Severe Asthma
John Harrington – Respiratory Clinical Nurse Consultant John Hunter Hospital
Jane Civitico – Respiratory Clinical Nurse Consultant RPAH
Steven Maltby – Research Academic Centre of Excellence in Severe Asthma
John Hunter Hospital Clinical Guideline – Administration and Monitoring of Omalizumab (Xolair)
Xolair Production Information https://www.ebs.tga.gov.au/ebs/picmi/picmirepository.nsf/pdf?OpenAgent&id=CP-2009-PI-00304-3&d=2017110116114622483
(date accessed 01-11-2017)
Severe allergic asthma – adolescent and adult patient (Human Services Australia, PBS guidelines) https://www.humanservices.gov.au/health-professionals/enablers/severe-allergic-asthma-adolescent-and-adult-patient (date accessed 13-01-2017)
Paediatric severe allergic asthma Initial PBS authority application form – https://www.humanservices.gov.au/health-professionals/forms/pb188 (date accessed 13-01-2017)
Paediatric severe allergic asthma continuing PBS authority application form – https://www.humanservices.gov.au/health-professionals/forms/pb189 (date accessed 13-01-2017)
Adolescent and adult severe allergic asthma Initial PBS authority application form – https://www.humanservices.gov.au/health-professionals/forms/pb075 (date accessed 13-01-2017)
Adolescent and adult severe allergic asthma Continuing PBS authority application form – https://www.humanservices.gov.au/health-professionals/forms/pb076 (date accessed 13-01-2017)