Summary
Abstract
The long-acting β2-agonist salmeterol and the corticosteroid fluticasone propionate are available as a combination inhalation device for the treatment of persistent asthma.
Well designed studies in adults, adolescents and children aged ≥4 years, demonstrate that combined salmeterol/fluticasone propionate 50/100, 50/250 and 50/500μg administered via a dry powder inhaler (DPI) is clinically equivalent to concurrent delivery of the same dosages of the 2 drugs via separate DPIs.
In adults and adolescents, combined salmeterol/fluticasone 50/100 and 50/250μg twice daily produced rapid improvements in lung function that were consistently greater than those in patients receiving monotherapy twice daily salmeterol 50μg, fluticasone propionate 100 or 250μg or placebo in 2 well designed studies. Recipients of the combination had a significantly greater probability of completing 12 weeks of treatment than patients receiving monotherapy or placebo. The combination also produced significant improvements between baseline and end-point in all secondary outcome variables (morning and evening peak expiratory flow, daytime symptom scores, days and nights without asthma symptoms and requirements for as-needed β-agonists) and health-related quality of life (QOL). Combination therapy was superior to monotherapy with salmeterol and placebo for all outcomes in both studies, and was superior to fluticasone propionate 100μg for all but 1 outcome (nights without awakenings) in 1 study. Similar results were obtained in patients who had previously been using short acting β2-agonists alone.
Combined twice daily salmeterol/fluticasone propionate 50/100 and 50/250μg produced greater improvements in lung function than inhaled budesonide at higher dosages than fluticasone propionate in the combination.
Combined salmeterol/fluticasone propionate 50/250μg produced similar improvements in lung function to concurrent budesonide 800μg plus formoterol 12μg when given twice daily for 12 weeks. In another 12-week trial, combined salmeterol/fluticasone propionate 50/100μg was more effective than oral montelukast 10 mg/day plus fluticasone propionate 100μg twice daily in patients with suboptimally controlled asthma.
Salmeterol/fluticasone is more cost effective than monotherapy with fluticasone propionate or budesonide.
The most frequent adverse events associated with salmeterol/fluticasone propionate are headache, throat irritation, hoarseness and candidiasis.
Conclusion: Combined salmeterol/fluticasone propionate is as effective as the 2 drugs given concurrently via separate inhalers and significantly more effective than either drug given alone at the same nominal dosage. The combination is also significantly more effective than montelukast plus fluticasone propionate or monotherapy with inhaled budesonide. Furthermore, the combination is more cost effective than inhaled corticosteroid monotherapy.
Pharmacodynamic Properties
Salmeterol, a long-acting inhaled β2-agonist bronchodilator, protects against bronchoconstriction and may have some anti-inflammatory properties.
The inhaled corticosteroid fluticasone propionate inhibits eosinophil activation and the subsequent release of inflammatory mediators and may also reduce bronchial hyperresponsiveness in patients with asthma.
The systemic pharmacodynamic effects of salmeterol and fluticasone propionate administered together are similar to those observed when the drugs are given alone or concurrently. No evidence of interaction between the 2 drugs was observed in single and multiple dose studies of the effects of fluticasone propionate on 24-hour urinary cortisol excretion versus equivalent doses of fluticasone propionate alone. When salmeterol/fluticasone propionate 50/100μg was compared with placebo, no significant effect on 24-hour urinary cortisol excretion was detected.
Similarly, in a cumulative dose study comparing the combination with equivalent doses of salmeterol alone, most pharmacodynamic responses to salmeterol were unaffected by the presence of fluticasone propionate.
In children aged 4 to 11 years who had previously been treated with inhaled corticosteroids, geometric mean morning serum cortisol levels increased during 12 weeks of twice daily treatment with salmeterol plus fluticasone propionate 50/100μg. However, no significant differences in the frequency of abnormal plasma cortisol values were detected in adults with persistent asthma during treatment with combined salmeterol/fluticasone propionate 50/250μg twice daily, either drug alone or placebo in a multicentre randomised double-blind study.
Pharmacokinetic Properties
Salmeterol is not detectable in plasma after administration by inhalation and there is no evidence that concomitant administration of fluticasone propionate alters the systemic availability of salmeterol.
Studies comparing fluticasone propionate monotherapy with each strength of salmeterol/fluticasone propionate suggest that the systemic availability of fluticasone propionate is not increased when salmeterol is given concomitantly.
Both salmeterol and fluticasone propionate are metabolised by cytochrome P450 3A4. Renal clearance accounts for <0.02% of the total clearance of fluticasone propionate and for <5% of salmeterol.
Therapeutic Efficacy
The therapeutic efficacy of combined salmeterol and fluticasone propionate in patients with persistent asthma has been established in large multicentre randomised double-blind parallel-group studies. With the exception of 1 study that enrolled patients with a history of recent salmeterol treatment alone, and 1 trial that recruited patients who had used short acting β2-agonists only, eligible patients in all studies had symptomatic asthma despite ongoing treatment with inhaled corticosteroids. The dose of salmeterol (50 μg/actuation) was constant in all studies regardless of whether patients received the drug alone, or in combination or concurrently with fluticasone propionate. The dose of fluticasone propionate varied (100, 250 or 500 μg/actuation). All inhaled products in these studies were administered as 1 actuation twice daily.
Studies in adults and adolescents aged ≥12 years and in children aged 4 to 11 years, have demonstrated the clinical efficacy of combined delivery of salmeterol/fluticasone propionate 50/100, 50/250 and 50/500μg twice daily via the Diskus dry powder inhaler (DPI) to be equivalent to that of concurrent delivery of the same dosages of the 2 drugs via separate Diskus DPIs as assessed by lung function and asthma symptom scores.
Combined salmeterol/fluticasone propionate has recently been formulated as a chlorofluorocarbon (CFC)-free pressurised metered dose inhaler (MDI). Two studies have demonstrated equivalency of this formulation with the Diskus DPI. Improvements in mean morning peak expiratory flow (PEF) were similar after 12 weeks of treatment with combined salmeterol/fluticasone propionate 50/100 or 50/500 delivered via the DPI or MDI.
The efficacy of combined salmeterol/fluticasone propionate was subsequently compared with that of the individual components in 3 well designed US studies which enrolled adults and adolescents aged ≥12 years. Combined salmeterol/fluticasone 50/100 or 50/250μg produced rapid and consistent improvements in lung function that were maintained throughout two 12-week studies in patients previously treated with inhaled corticosteroids or salmeterol. The combination had a significantly faster onset of effect on day 1 of the studies than placebo or fluticasone propionate. Improvements in forced expiratory volume in 1 second (FEV1) between baseline and end-point were consistent between studies and were significantly greater in those treated twice daily with combined salmeterol/fluticasone propionate 50/100μg or 50/250μg than either salmeterol 50μg or fluticasone propionate 100 or 250μg. Improvements in FEV1 were similar regardless of baseline corticosteroid therapy or whether patients were using inhaled corticosteroids or salmeterol alone prior to enrolment.
The probability of being withdrawn from either study because of asthma exacerbations was significantly lower in patients randomised to combination therapy (≤4%) than in each of the other groups. Placebo recipients had the highest rates of withdrawal for worsening asthma (≥49%) followed by salmeterol-treated patients (≥35%).
Treatment with combined salmeterol/fluticasone propionate produced significant improvements between baseline and end-point in all secondary outcome variables (morning and evening PEF), daytime symptom scores, days and nights without asthma symptoms and requirements for as-needed β-agonists) and health-related quality of life (QOL). Combination therapy was superior to monotherapy with salmeterol and placebo for all outcomes in both studies, and was superior to fluticasone propionate for all but 1 outcome (nights without awakenings) in the study that used the lower dosage (50/100μg). Clinically significant differences in total Asthma Quality of Life Questionnaire (AQLQ) scores (≥0.5 units), were obtained in patients treated with the combination compared with placebo (1.3 units) and salmeterol 50μg (≥1 units) but not fluticasone propionate 100 or 250μg.
Similar results were obtained in patients who had previously been using short acting β2-agonists alone. Recipients of combined salmeterol/fluticasone propionate 50/100μg experienced significantly greater improvements in the area under the FEV1 curve (AUC0-12h FEV1), mean morning and evening PEF, and FEV1 than did patients treated with salmeterol or fluticasone propionate alone after 12 weeks of treatment.
A further series of randomised double-blind parallel-group studies have compared combined salmeterol/fluticasone propionate with inhaled budesonide or concurrent budesonide plus formoterol. Salmeterol/fluticasone propionate 50/250μg had a rapid onset of action, such that, throughout the first week of treatment with the combination, mean morning PEF was significantly greater and the proportion of patients with no symptoms or no need for as-needed β2-agonists was significantly lower than in patients randomised to inhaled budesonide 800μg twice daily. These trends were maintained throughout the 24-week study. The combination also produced improvements in QOL scores that were clinically significant compared with baseline and statistically significant compared with scores in budesonide recipients after 24 weeks.
Improvements in mean morning and evening PEF were significantly greater among patients with persistent asthma randomised to combined salmeterol/fluticasone propionate 50/100μg twice daily than budesonide 400μg twice daily in a further 12-week study.
Similar improvements in lung function were obtained with combined salmeterol/fluticasone propionate 50/250μg and concurrent budesonide 800μg plus formoterol 12μg twice daily in a 12-week randomised double-blind multi-centre study.
Combined salmeterol/fluticasone propionate 50/100μg was more effective than the addition of oral montelukast 10 mg/day to fluticasone propionate 100μg twice daily in patients aged ≥15 years with suboptimally controlled asthma according to the results of a 12-week study. Mean morning PEF, the primary efficacy variable in the study, was significantly greater among patients treated with the combination on each day during the first week of treatment and in each week of the study thereafter. Similar trends were evident for improvements in mean evening PEF, clinic FEV1, and reductions in as-needed β2-agonist usage, all of which were significantly greater in patients treated with combined salmeterol/fluticasone propionate than montelukast plus fluticasone propionate. Asthma exacerbations also occurred in significantly fewer patients treated with the combination than montelukast plus fluticasone propionate (2 vs 6%). The mean change in total Daytime Asthma Symptom Scores was similar in patients in both treatment groups.
Pharmacoeconomic Considerations
Data from 3 studies comparing salmeterol/fluticasone propionate and fluticasone propionate have been subjected to cost-effectiveness analyses from the perspective of the Swedish healthcare system [valued in Swedish Kronor (SEK 1998)].
In all 3 studies, the total costs of asthma management were higher in the salmeterol/fluticasone propionate group than in the corresponding fluticasone propionate group. However, the cost per successfully-treated week was lower for salmeterol/fluticasone propionate across all 3 studies. The incremental cost effectiveness ratios varied from SEK12.6 ($US1.53) per additional successfully-treated week with salmeterol/fluticasone propionate 50/250μg to SEK192.1 ($US23.31) per additional successfully-treated week with salmeterol/fluticasone propionate 50/500μg.
A 24-week study comparing salmeterol/fluticasone propionate with budesonide has been subjected to cost-effectiveness analyses from Swedish, German and UK perspectives. Each analysis found salmeterol/fluticasone propionate to be more cost-effective than budesonide despite higher acquisition costs for the combination.
Tolerability
As salmeterol/fluticasone propionate is a combination of 2 drugs, the type and severity of adverse events associated with each component drug may be expected in patients receiving the combination product. There is no evidence, however, of additional adverse events following concurrent administration of the 2 drugs.
According to overall analysis of tolerability data from well designed studies the most frequent adverse events associated with salmeterol/fluticasone propionate are headache (incidence 2 to 5%), throat irritation (1 to 4%), hoarseness (≤4%) and oral candidiasis (1 to 4%).
The overall frequency of adverse events was similar between treatment groups in a comparative study in which patients received combined salmeterol/fluticasone propionate 50/250μg or budesonide 800μg twice daily for 24 weeks.
Withdrawal rates among patients treated with combined salmeterol/fluticasone propionate ranged from 0 to 10% and were similar to those in other treatment groups in the various studies.
Dosage and Administration
In the US, combined salmeterol/fluticasone propionate is indicated for long term maintenance treatment of asthma in patients aged ≥12 years. The recommended starting dosage is based on patients’ current asthma therapy. Twice daily salmeterol/fluticasone propionate 100/50μg via DPI is the recommended initial dosage in patients not currently receiving inhaled corticosteroids.
In the UK, combined salmeterol/fluticasone propionate is indicated in the treatment of asthma where use of the combination of a long-acting inhaled β2-agonist and inhaled corticosteroid is appropriate. This corresponds to ‘Step 3’ in the British Guidelines on Asthma Management.
The recommended dosages of salmeterol/fluticasone propionate in patients aged ≥12 years is 1 inhalation twice daily of the DPI (each inhalation contains 50μg salmeterol and either 100, 250 or 500μg fluticasone propionate) or 2 inhalations twice daily of the MDI (each inhalation contains salmeterol/fluticasone propionate 25/50μg, 25/125μg, or 25/250μg). The dosage of fluticasone propionate should be selected according to the severity of asthma in individual patients. In children aged <12 and ≥4 years, the recommended dosage is 1 inhalation twice daily of the lowest strength of the DPI (salmeterol/fluticasone propionate 50/100μg). No data are available regarding use of salmeterol/fluticasone propionate in children aged <4 years.
Salmeterol/fluticasone propionate should not be used to treat acute asthma symptoms for which a short acting β2-agonist bronchodilator is required. Patients should be advised to have their relief medication available at all times.
No dosage adjustment is required in the elderly or in patients with renal impairment. Patients with hepatic disease should be closely monitored during treatment with the combination.
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Various sections of the manuscript reviewed by: M. Aubier, Unité de Pneumologie, Hospital Bichat, Paris, France; E. Bateman, Respiratory Clinic, Groote Schuur Hospital and University of Cape Town, Cape Town, South Africa; W.E. Berger, Southern California Research Center, Mission Viejo, California, USA; M. Britton, St Peters Hospital, Chertsey, Surrey, England; R. Dahl, Department of Respiratory Diseases, Aarhus University Hospital, Aarhus C, Denmark.
Data Selection
Sources: Medical literature published in any language since 1966 on Salmeterol/Fluticasone-propionate, identified using Medline and EMBASE, supplemented by AdisBase (a proprietary database of Adis International, Auckland, New Zealand). Additional references were identified from the reference lists of published articles. Bibliographical information, including contributory unpublished data, was also requested from the company developing the drug.
Search strategy: Medline search terms were ‘Salmeterol Fluticasone’. EMBASE search terms were ‘Salmeterol Fluticasone’. AdisBase search terms were ‘Salmeterol/Fluticasone-propionate’. Searches were last updated 9 Oct 2000.
Selection: Studies in patients with persistent asthma who received combined salmeterol/fluticasone propionate. Inclusion of studies was based mainly on the methods section of the trials. When available, large, well controlled trials with appropriate statistical methodology were preferred. Relevant pharmacodynamic and pharmacokinetic data are also included.
Index terms: asthma, fluticasone propionate, salmeterol, salmeterol/fluticasone propionate, pharmacodynamics, pharmacokinetics, therapeutic use.
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Markham, A., Jarvis, B. Inhaled Salmeterol/Fluticasone Propionate Combination. Drugs 60, 1207–1233 (2000). https://doi.org/10.2165/00003495-200060050-00012
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DOI: https://doi.org/10.2165/00003495-200060050-00012