Download a pdf version of this document here: Mepolizumab Clinical Recommendation [v5 09 March 2018]
Mepolizumab Nucala is indicated as an add-on therapy for people with severe refractory eosinophilic asthma, aged ≥12 years.
Mepolizumab is a humanised monoclonal antibody (IgG1, kappa), which targets human IL-5 with high affinity and specificity. IL-5 is the major cytokine responsible for the growth and differentiation, recruitment, activation and survival of eosinophils.
Mepolizumab inhibits the bioactivity of IL-5 with nanomolar potency by blocking the binding of IL-5 to the alpha chain of the IL-5 receptor complex expressed on the eosinophil cell surface, thereby inhibiting IL-5 signalling and reducing the production and survival of eosinophils.
In clinical trials, reduction in blood eosinophils was observed consistently following treatment with mepolizumab. The magnitude and duration of this reduction was dose- dependent. Following a dose of 100 mg administered subcutaneously every 4 weeks for 32 weeks, blood eosinophils were reduced to a geometric mean count of 40 cells/μL (0.04 x 109 cells/L). This corresponds to a geometric mean reduction of 84% compared to placebo. This magnitude of reduction was observed within 4 weeks of treatment and was maintained throughout the treatment period.
In a meta-analysis the relative rate reduction for hospitalisations compared to placebo was 0.49; 95% CI, 0.30-0.80; P = 0.004 and for hospitalisation/emergency room visit the relative rate was, 0.49; 95% CI, 0.33-0.73; P < 0.001) (1). It also has an oral-steroid sparing effect, permitting an average OCS dose reduction of 50% in patients with severe OCS dependent eosinophilic asthma (2). Responding patients are adults and adolescents with severe asthma, who experience persistent asthma exacerbations despite optimal inhaled therapy, and with evidence of eosinophilia from blood eosinophil counts (≥300 cells/μL or ≥0.3 x 109 cells/L)) or sputum eosinophilia (>3%)(3).
The safety and efficacy of mepolizumab has not been established in adolescents weighing < 45 kg.
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
a. Asthma Control Questionnaire (ACQ-5) score ≥2 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.
Some exemptions to the above treatment requirements, based on toxicity, are possible. See https://www.humanservices.gov.au/organisations/health-professionals/enablers/severe-asthma-toxicity-criteria-and-severity-descriptors for details
(Extracted from Nucala Mepolizumab Product Information (PI), for further information not included here refer to the PI)
Mepolizumab should not be used to treat acute asthma exacerbations.
Asthma-related adverse events or exacerbations may occur during treatment with Mepolizumab. Patients should be instructed to seek medical advice if their asthma remains uncontrolled or worsens after initiation of treatment with Mepolizumab.
Abrupt discontinuation of asthma medication (including inhaled and oral corticosteroids or long acting beta agonists) after initiation of Mepolizumab therapy is not recommended. Reductions in inhaled and oral corticosteroid doses, if warranted, should be gradual and performed under the supervision of a physician.
Acute and delayed systemic reactions, including hypersensitivity reactions (e.g. anaphylaxis, urticaria, angioedema, rash, bronchospasm, hypotension), have occurred following administration of mepolizumab. These reactions generally occur within hours of administration, but in some instances had a delayed onset (i.e., days). These reactions may occur for the first time after a long duration of treatment. In the event of a hypersensitivity reaction, mepolizumab should be discontinued.
Eosinophils may be involved in the immunological response to some helminth infections. Patients with pre-existing helminth infections were excluded from participation in the clinical programme. Patients with pre-existing helminth infections should be treated for their infection prior to mepolizumab therapy. If patients become infected whilst receiving treatment with mepolizumab and do not respond to anti-helminth treatment, temporary discontinuation of mepolizumab should be considered.
In controlled clinical trials, 2 serious adverse reactions of herpes zoster occurred in patients treated with mepolizumab versus none in the placebo group.
The effect of mepolizumab on human pregnancy is unknown. No treatment related effects on embryofetal or postnatal development have been shown in animal studies.
Mepolizumab should be used during pregnancy only if the expected benefit to the mother justifies the potential risk to the fetus.
There are no data regarding the excretion of mepolizumab in human milk. A decision should be made whether to discontinue breast-feeding or discontinue mepolizumab, taking into account the importance of breast-feeding to the infant and the importance of the drug to the mother.
The safety and efficacy of mepolizumab in children under the age of 12 years has not yet been established.
No formal studies have been conducted in elderly patients.
The recommended dose of mepolizumab is 100mg, administered by subcutaneous injection every four weeks.
Unopened vials should be refrigerated at temperatures between 2-8OC (Do not freeze). The vial should be stored in its original packaging.
After reconstitution with Water for Injection, the solution is stable for up to 6 hours if stored below 30OC. Protection from light is not necessary during administration.
The patient should remain for one hour after the first mepolizumab injection in an area under direct staff observation. For subsequent doses an observation period of 30 minutes is required.
Mepolizumab should be reconstituted and administered by a health care professional. Monitoring of patients after administration of biological agents is recommended.
Department of Human Services Complex Drugs Programs
Reply Paid 9826 HOBART TAS 7001
Alternatively, submit the completed application documents through a Provider Digital Access (PRODA) account. More information on registration and management of a PRODA account can be found here:
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.
Patients should be reminded to continue to take their other asthma medications unless the regimen is changed by their managing physician.
Procedure can only take place in an area where there is access to emergency procedures and adequate medical support.
Ensure rescue medication such as adrenaline, salbutamol MDI and spacer or nebuliser therapy, antihistamines and systemic corticosteroids are accessible.
Ensure mepolizumab has been ordered by the respiratory physician on an approved medication chart.
Confirm that the patient has taken their usual asthma medications.
Assess current asthma control and exacerbation status and manage as required.
Assess clinical progress by recording medication requirements and changes since last visit.
Perform baseline observations (HR, RR, BP, SpO2 and Temp).
Spirometry assessment should be performed at baseline and PBS continuation assessment. At other visits it may be performed according to the physician’s discretion.
Record all information in patient’s medical record.
Mepolizumab is provided as a lyophilised powder in a single-use vial for subcutaneous injection only and should be reconstituted by a healthcare professional using standard aseptic techniques as follows:
Preparation in a laminar flow hood is not indicated in any product information nor supported by evidence.
You may need to tip the vial on its side and roll gently to dissolve all of the dose.
Direct 30 minutely observations are necessary for 1 hour after the first mepolizumab injection and for 30 minutes after subsequent injections: (HR, RR, BP, SpO2 and Temp.) Record and monitor observations on Standard Adult General Observation (SAGO) Chart (or state equivalent).
If the patient refuses to wait for the recommended period of time he or she must sign a waiver, and a discussion with the treating physician is to precede the next administration booking.
The first three doses of mepolizumab should be administered within an asthma clinic; following this ongoing administration may continue in this way or through a primary care facility suitably equipped to provide ongoing dosing. When this occurs all patients must return to the asthma clinic within 26 weeks after the first dose and 18 weeks for subsequent doses in order to have their asthma assessed and their suitability for continuation of the treatment reviewed. The treating respiratory physician must submit the application for continuation.
All PBS applications for continuing treatment must include a measurement of response to the prior course of therapy. A positive response to mepolizumab is defined as a reduction in the ACQ5 score of at least 0.5; and/or maintenance OCS dose reduced by 25% from baseline with no deterioration in the ACQ5 score from baseline.
The assessment of the patient’s response to the prior course of treatment must be made at around 26 to 30 weeks after the first dose for patients receiving initial treatment.
The assessment at around 26 to 30 weeks, 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.
For patients receiving grandfather PBS treatment or for second and subsequent courses, the assessment must be made around 18 to 22 weeks of treatment.
Continuation forms can be downloaded at: https://www.humanservices.gov.au/health-professionals/forms/pb195.
The Australian Mepolizumab Registry collects and reports on data from people with severe refractory eosinophilic asthma who receive mepolizumab.
The Registry will provide a mechanism for sharing information which will help researchers and clinicians to better understand the use, efficacy, and safety associated with the treatment of severe asthma with mepolizumab. All information collected from participating sites will be securely stored in the main data repository. Access to the Register will be restricted to authorised users. The Registry will report regularly on characteristics and outcomes for this population.
The Australian Mepolizumab Registry is an investigator initiated study supported by a clinical research grant from GlaxoSmithKline [dated 21st October 2016; protocol 207455] covering the period 1/10/2016 until 1/10/2021].
For further information please contact:
Dr Erin Harvey
Australian Mepolizumab Registry (AMR)
Level 2 West Wing, Hunter Medical Research Institute Building
Kookaburra Circuit, New Lambton Heights NSW 2305
T: +61 2 4042 0099
F: +61 2 4042 0046
Professor Vanessa McDonald – Centre of Excellence in Severe Asthma
Jane Civitico – Respiratory Clinical Nurse Consultant RPAH
Professor Peter Gibson – Centre of Excellence in Severe Asthma
Steven Maltby – Research Academic, Centre of Excellence in Severe Asthma
Investigators from the Centre of Excellence in Severe Asthma – Professor Helen Reddel, Professor Peter Wark, Professor Greg King, Clinical Professor Alan James, Professor John Upham, Professor Ian Yang
Dr Edmond Lau
Dr Rebecca Davis
Dr Raymond Chan
Dr Erin Harvey
John Harrington – Respiratory Clinical Nurse Consultant John Hunter Hospital
Mepolizumab Product Information – https://au.gsk.com/media/351182/nucala_pi_au_002_approved.pdf (date accessed 09-03-2018)
Adolescent and adult severe eosinophilic asthma Initial PBS authority application. https://www.humanservices.gov.au/health-professionals/forms/pb194. (date accessed 09-03-2018)
Adolescent and adult severe eosinophilic asthma Continuing PBS authority application https://www.humanservices.gov.au/health-professionals/forms/pb195. (date accessed 09-03-2018)
Parasitic infections are relevant when considering mepolizumab treatment, because anti-IL5 treatment could theoretically lead to disseminated parasitic infection, and because parasitic infections are a common cause of mild peripheral eosinophilia (e.g. they were found in 64% of people investigated in UK for eosinophils >500), particularly in those who had visited/come from tropical areas (e.g. parasitic infections found in 39% of Caucasian travelers returning to UK who had eosinophils >450; and 76% of immigrants to southern Spain who had eosinophils >500).
In Australia, for patients with eosinophilia, the most important parasitic infection to consider before starting mepolizumab is Strongyloides stercoralis, because:
There are no validated screening questionnaires for parasitic infection. Australian infectious diseases specialists therefore recommend that, until further data are available, Strongyloides serology should be obtained for all patients being considered for mepolizumab, regardless of travel or GIT history. If serology is positive, the patient should be treated5 before commencing mepolizumab, regardless of whether or not they have symptoms.
It should be noted that Strongyloides infection should also be considered before commencing patients on oral corticosteroids.
 J. Whetham et al. Investigation of Tropical Eosinophilia; Assessing a Strategy Based on Geographical Area. Journal of Infection (2003) 46: 180-185
 A. D. Harries et al. Eosinophilia in Caucasians returning from the tropics. Transactions of Royal Society of Tropical Medicine and Hygiene 1986 80, 327-328
 Salas-Coronas et al, Evaluation of eosinophilia in immigrants in Southern Spain using tailored screening and treatment protocols: A prospective study. Travel Medicine and Infectious Disease (2015) 13, 315e321
 Page W and Spear R, Chronic strongyloidiasis – Don’t look and you won’t find. Australian Family Physician Vol.45, No.1–2, Jan–Feb 2016
 Centres for Disease Control and Prevention, Resources for Health Professionals, Parasites – Strongyloides https://www.cdc.gov/parasites/strongyloides/health_professionals/index.html