Pharmacotherapeutic group: Drugs for obstructive airway diseases, adrenergics in combination with anticholinergics, ATC code: R03AL04
Mechanism of action
Ultibro Breezhaler
When indacaterol and glycopyrronium are administered together in Ultibro Breezhaler, they provide additive efficacy due to their different mode of action targeting different receptors and pathways to achieve smooth muscle relaxation. Due to the differential density of beta2-adrenoceptors and M3-receptors in central versus peripheral airways, beta2-agonists should be more effective in relaxing peripheral airways, whilst an anticholinergic compound may be more effective in central airways. Thus for bronchodilation in both peripheral and central airways of the human lung a combination of a beta2-adrenergic agonist and a muscarinic antagonist may be beneficial.
Indacaterol
Indacaterol is a long-acting beta2-adrenergic agonist for once-daily administration. The pharmacological effects of beta2-adrenoceptor agonists, including indacaterol, are at least in part attributable to stimulation of intracellular adenyl cyclase, the enzyme that catalyses the conversion of adenosine triphosphate (ATP) to cyclic-3', 5'-adenosine monophosphate (cyclic AMP). Increased cyclic AMP levels cause relaxation of bronchial smooth muscle. In vitro studies have shown that indacaterol has multi-fold greater agonist activity at beta2-receptors compared to beta1 and beta3-receptors.
When inhaled, indacaterol acts locally in the lung as a bronchodilator. Indacaterol is a partial agonist at the human beta2-adrenergic receptor with nanomolar potency.
Although beta2-adrenergic receptors are the predominant adrenergic receptors in bronchial smooth muscle and beta1-adrenergic receptors are the predominant receptors in the human heart, there are also beta2-adrenergic receptors in the human heart comprising 10% to 50% of the total adrenergic receptors. Their presence in the heart raises the possibility that even highly selective beta2-adrenergic agonists may have cardiac effects.
Glycopyrronium
Glycopyrronium is an inhaled long-acting muscarinic receptor antagonist (anticholinergic) for once-daily maintenance bronchodilator treatment of COPD. Parasympathetic nerves are the major bronchoconstrictive neural pathway in airways, and cholinergic tone is the key reversible component of airflow obstruction in COPD. Glycopyrronium works by blocking the bronchoconstrictor action of acetylcholine on airway smooth muscle cells, thereby dilating the airways.
Glycopyrronium bromide is a high affinity muscarinic receptor antagonist. A greater than 4-fold selectivity for the human M3 receptors over the human M2 receptor has been demonstrated using radioligand binding studies.
Pharmacodynamic effects
The combination of indacaterol and glycopyrronium in Ultibro Breezhaler showed a rapid onset of action within 5 minutes after dosing. The effect remains constant over the whole 24-h dosing interval.
The mean bronchodilator effect derived from serial FEV1 measurements over 24 h was 320 ml after 26 weeks of treatment. The effect was significantly greater for Ultibro Breezhaler, when compared to indacaterol, glycopyrronium or tiotropium alone (difference 110 ml, for each comparison).
There was no evidence for tachyphylaxis to the effect of Ultibro Breezhaler over time when compared to placebo or its monotherapy components.
Effects on heart rate
Heart rate effects in healthy volunteers were investigated after a single dose of 4 times the recommended therapeutic dose of Ultibro Breezhaler administered in four dose steps each separated by one hour and compared to the effects of placebo, indacaterol, glycopyrronium and salmeterol.
The largest time-matched heart rate increase compared to placebo was +5.69 bpm (90% CI [2.71, 8.66]), the largest decrease was -2.51 bpm (90% CI [-5.48, 0.47]). Overall the effect on heart rate over time did not show a consistent pharmacodynamic effect of Ultibro Breezhaler.
Heart rate in COPD patients at supratherapeutic dose levels was investigated. There were no relevant effects of Ultibro Breezhaler on mean heart rate over 24 h and heart rate assessed after 30 minutes, 4 h and 24 h.
QT interval
A thorough QT (TQT) study in healthy volunteers with high doses of inhaled indacaterol (up to twice the maximum recommended therapeutic dose) did not demonstrate a clinically relevant effect on the QT interval. Similarly, for glycopyrronium no QT prolongation was observed in a TQT study after an inhaled dose of 8 times the recommended therapeutic dose.
The effects of Ultibro Breezhaler on QTc interval were investigated in healthy volunteers after inhalation of Ultibro Breezhaler up to 4 times the recommended therapeutic dose in four dose steps each separated by one hour. The largest time-matched difference versus placebo was 4.62 ms (90% CI 0.40, 8.85 ms), the largest time-matched decrease was -2.71 ms (90% CI -6.97, 1.54 ms), indicating that Ultibro Breezhaler had no relevant impact on the QT interval, as was expected by the properties of its components.
In COPD patients, supratherapeutic doses between 116 micrograms/86 micrograms and 464 micrograms/86 micrograms of Ultibro Breezhaler showed a higher proportion of patients with QTcF increases vs. baseline between 30 ms and 60 ms (ranging from 16.0% to 21.6% vs. 1.9% for placebo), but there were no QTcF increases >60 ms from baseline. The highest dose level of 464 micrograms/86 micrograms Ultibro Breezhaler also showed a higher proportion of absolute QTcF values >450 ms (12.2% vs. 5.7% for placebo).
Serum potassium and blood glucose
In healthy volunteers, after the administration of 4 times the recommended therapeutic dose of Ultibro Breezhaler, the effect on serum potassium was very small (maximal difference –0.14 mmol/l when compared to placebo). The maximal effect on blood glucose was 0.67 mmol/l.
Clinical efficacy and safety
The Ultibro Breezhaler clinical Phase III development programme included six studies in which over 8,000 patients were enrolled: 1) a 26-week placebo- and active-controlled (indacaterol once daily, glycopyrronium once daily, open-label tiotropium once daily) study; 2) a 26-week active-controlled (fluticasone/salmeterol twice daily) study; 3) a 64-week active-controlled (glycopyrronium once daily, open-label tiotropium once daily) study; 4) a 52-week placebo-controlled study; 5) a 3-week placebo- and active-controlled (tiotropium once daily) exercise tolerance study; and 6) a 52-week active-controlled (fluticasone/salmeterol twice daily) study.
In four of these studies patients were enrolled who had a clinical diagnosis of moderate to severe COPD. In the 64-week study patients were enrolled who had severe to very severe COPD with a history of ≥1 moderate or severe COPD exacerbation in the previous year. In the 52-week active-controlled study, patients were enrolled who had moderate to very severe COPD with a history of ≥1 moderate or severe COPD exacerbation in the previous year.
Effects on lung function
Ultibro Breezhaler showed clinically meaningful improvements in lung function (as measured by the forced expiratory volume in one second, FEV1) in a number of clinical studies. In Phase III studies, bronchodilator effects were seen within 5 minutes after the first dose and were maintained over the 24-hour dosing interval from the first dose. There was no attenuation of the bronchodilator effect over time.
The magnitude of the effect was dependent on the degree of reversibility of airflow limitation at baseline (tested by administration of a short-acting muscarinic antagonist bronchodilator and a short-acting beta2-agonist bronchodilator): Patients with the lowest degree of reversibility at baseline (<5%) generally exhibited a lower bronchodilator response than patients with a higher degree of reversibility at baseline (≥5%). At 26 weeks (primary endpoint), Ultibro Breezhaler increased trough FEV1 by 80 ml in patients (Ultibro Breezhaler n=82; placebo n=42) with the lowest degree of reversibility (<5%) (p=0.053) and by 220 ml in those patients (Ultibro Breezhaler n=392, placebo n=190) with a higher degree of reversibility at baseline (≥5%) compared to placebo (p<0.001).
Trough and peak FEV1:
Ultibro Breezhaler increased post-dose trough FEV1 by 200 ml compared to placebo at the 26-week primary endpoint (p<0.001) and showed statistically significant increases compared to each monotherapy component treatment arm (indacaterol and glycopyrronium) as well as the tiotropium treatment arm, as shown in the below table.
Post-dose trough FEV1 (least squares mean) at day 1 and week 26 (primary endpoint)
| Treatment difference | Day 1 | Week 26 |
| Ultibro Breezhaler – placebo | 190 ml (p<0.001) | 200 ml (p<0.001) |
| Ultibro Breezhaler – indacaterol | 80 ml (p<0.001) | 70 ml (p<0.001) |
| Ultibro Breezhaler – glycopyrronium | 80 ml (p<0.001) | 90 ml (p<0.001) |
| Ultibro Breezhaler – tiotropium | 80 ml (p<0.001) | 80 ml (p<0.001) |
The mean pre-dose FEV1 (average of the values taken at -45 and -15 minutes prior to the morning dose of study medication) was statistically significant in favour of Ultibro Breezhaler at week 26 compared to fluticasone/salmeterol (least squares [LS] mean treatment difference 100 ml, p<0.001), at week 52 compared to placebo (LS mean treatment difference 189 ml, p<0.001) and at all visits up to week 64 compared to glycopyrronium (LS mean treatment difference 70-80 ml, p<0.001) and tiotropium (LS mean treatment difference 60-80 ml, p<0.001). In the 52-week active-controlled study, the mean pre-dose FEV1 was statistically significant in favour of Ultibro Breezhaler at all visits up to week 52 compared to fluticasone/salmeterol (LS mean treatment difference 62-86 ml, p<0.001). At week 26, Ultibro Breezhaler produced statistically significant improvement in peak FEV1 compared to placebo in the first 4 hours post dose (LS mean treatment difference 330 ml) (p<0.001).
FEV1 AUC:
Ultibro Breezhaler increased post-dose FEV1 AUC0-12 (primary endpoint) by 140 ml at 26 weeks (p<0.001) compared to fluticasone/salmeterol.
Symptomatic outcomes
Breathlessness:
Ultibro Breezhaler statistically significantly reduced breathlessness as evaluated by the Transitional Dyspnoea Index (TDI); it demonstrated a statistically significant improvement in the TDI focal score at week 26 compared to placebo (LS mean treatment difference 1.09, p<0.001), tiotropium (LS mean treatment difference 0.51, p=0.007) and fluticasone/salmeterol (LS mean treatment difference 0.76, p=0.003). Improvements versus indacaterol and glycopyrronium were 0.26 and 0.21, respectively.
A statistically significantly higher percentage of patients receiving Ultibro Breezhaler responded with a 1 point or greater improvement in the TDI focal score at week 26 compared to placebo (68.1% and 57.5% respectively, p=0.004). A higher proportion of patients demonstrated clinically meaningful response at week 26 on Ultibro Breezhaler as compared to tiotropium (68.1% Ultibro Breezhaler versus 59.2% tiotropium, p=0.016) and fluticasone/salmeterol (65.1% Ultibro Breezhaler versus 55.5% fluticasone/salmeterol, p=0.088).
Health-related quality of life:
Ultibro Breezhaler has also shown a statistically significant effect on health-related quality of life measured using the St. George's Respiratory Questionnaire (SGRQ) as indicated by a reduction in SGRQ total score at 26 weeks compared to placebo (LS mean treatment difference -3.01, p=0.002) and tiotropium (LS mean treatment difference -2.13, p=0.009) and reductions versus indacaterol and glycopyrronium were -1.09 and -1.18, respectively. At 64 weeks, the reduction compared to tiotropium was statistically significant (LS mean treatment difference -2.69, p<0.001). At 52 weeks, the reduction compared to fluticasone/salmeterol was statistically significant (LS mean treatment difference -1.3, p=0.003).
A higher percentage of patients receiving Ultibro Breezhaler responded with a clinically meaningful improvement in SGRQ score (defined as a decrease of at least 4 units from baseline) at week 26 compared to placebo (63.7% and 56.6% respectively, p=0.088) and tiotropium (63.7% Ultibro Breezhaler vs. 56.4% tiotropium, p=0.047), at week 64 compared to glycopyrronium and tiotropium (57.3% Ultibro Breezhaler versus 51.8% glycopyrronium, p=0.055; versus 50.8% tiotropium, p=0.051, respectively), and at week 52 compared to fluticasone/salmeterol (49.2% Ultibro Breezhaler vs. 43.7% fluticasone/salmeterol, odds ratio: 1.30, p<0.001).
Daily activities
Ultibro Breezhaler demonstrated a statistically superior improvement versus tiotropium in the percentage of “days able to perform usual daily activities” over 26 weeks (LS mean treatment difference 8.45%, p<0.001). At week 64, Ultibro Breezhaler showed numerical improvement over glycopyrronium (LS mean treatment difference 1.95%; p=0.175) and statistical improvement over tiotropium (LS mean treatment difference 4.96%; p=0.001).
COPD exacerbations
In a 64-week study comparing Ultibro Breezhaler (n=729), glycopyrronium (n=739) and tiotropium (n=737), Ultibro Breezhaler reduced the annualised rate of moderate or severe COPD exacerbations by 12% compared to glycopyrronium (p=0.038) and by 10% compared to tiotropium (p=0.096). The number of moderate or severe COPD exacerbations/patient-years was 0.94 for Ultibro Breezhaler (812 events), 1.07 for glycopyrronium (900 events) and 1.06 for tiotropium (898 events). Ultibro Breezhaler also statistically significantly reduced the annualised rate of all COPD exacerbations (mild, moderate or severe) by 15% as compared to glycopyrronium (p=0.001) and 14% as compared to tiotropium (p=0.002). The number of all COPD exacerbations/patient-years was 3.34 for Ultibro Breezhaler (2,893 events), 3.92 for glycopyrronium (3,294 events) and 3.89 for tiotropium (3,301 events).
In the 52-week study comparing Ultibro Breezhaler (n=1,675) and fluticasone/salmeterol (n=1,679), Ultibro Breezhaler met the primary study objective of non-inferiority in rate of all COPD exacerbations (mild, moderate or severe) compared to fluticasone/salmeterol. The number of all COPD exacerbations/patient-years was 3.59 for Ultibro Breezhaler (4,531 events) and 4.03 for fluticasone/salmeterol (4,969 events). Ultibro Breezhaler further showed superiority in reducing the annualised rate of all exacerbations by 11% versus fluticasone/salmeterol (p=0.003).
Compared to fluticasone/salmeterol, Ultibro Breezhaler reduced the annualised rate of both moderate or severe exacerbations by 17% (p<0.001), and of severe exacerbations (requiring hospitalisation) by 13% (not statistically significant, p=0.231). The number of moderate or severe COPD exacerbations/patient-years was 0.98 for Ultibro Breezhaler (1,265 events) and 1.19 for fluticasone/salmeterol (1,452 events). Ultibro Breezhaler prolonged time to first moderate or severe exacerbation with a 22% reduction in risk of an exacerbation (p<0.001) and prolonged time to first severe exacerbation with a 19% reduction in risk of an exacerbation (p=0.046).
The incidence of pneumonia was 3.2% in the Ultibro Breezhaler arm compared to 4.8% in the fluticasone/salmeterol arm (p=0.017). Time to first pneumonia was prolonged with Ultibro Breezhaler compared to fluticasone/salmeterol (p=0.013).
In another study comparing Ultibro Breezhaler (n=258) and fluticasone/salmeterol (n=264), for 26 weeks, the number of moderate or severe COPD exacerbations/patient-years was 0.15 versus 0.18 (18 events versus 22 events), respectively (p=0.512), and the number of all COPD exacerbations/patients-years (mild, moderate or severe) was 0.72 versus 0.94 (86 events versus 113 events), respectively (p=0.098).
Use of rescue medication
Over 26 weeks, Ultibro Breezhaler statistically significantly reduced the use of rescue medication (salbutamol) by 0.96 puffs per day (p<0.001) compared to placebo, 0.54 puffs per day (p<0.001) compared to tiotropium and 0.39 puffs per day (p=0.019) compared to fluticasone/salmeterol. Over 64 weeks, this reduction was 0.76 puffs per day (p<0.001) compared to tiotropium. Over 52 weeks, Ultibro Breezhaler reduced the use of rescue medication by 0.25 puffs per day compared to fluticasone/salmeterol (p<0.001).
Exercise tolerance
Ultibro Breezhaler, dosed in the morning, reduced dynamic hyperinflation and improved the length of time exercise could be maintained from the first dose onwards. On the first day of treatment, inspiratory capacity under exercise was significantly improved (LS mean treatment difference 250 ml, p<0.001) compared to placebo. After three weeks of treatment, the improvement in inspiratory capacity with Ultibro Breezhaler was greater (LS mean treatment difference 320 ml, p<0.001) and exercise endurance time increased (LS mean treatment difference 59.5 seconds, p=0.006) compared to placebo.
Paediatric population
The European Medicines Agency has waived the obligation to submit the results of studies with Ultibro Breezhaler in all subsets of the paediatric population in chronic obstructive pulmonary disease (COPD) (see section 4.2 for information on paediatric use).