Viozan (
sibenadet HCl,
AR-C68397AA) is a novel dual D2
dopamine receptor, beta2-adrenoceptor agonist, developed specifically to treat the key symptoms of
chronic obstructive pulmonary disease (
COPD),
breathlessness,
cough and sputum. The dual sensory nerve modulation and
bronchodilator effects of
sibenadet have been demonstrated in initial dose-ranging studies of patients with
COPD and large-scale clinical evaluation has now been completed.
Sibenadet efficacy was determined by assessing symptomatic changes, as defined by the novel assessment tool, the
Breathlessness,
Cough and Sputum Scale (BCSS). The findings of two placebo-controlled studies are reported. These multicentre, double-blind, placebo-controlled studies recruited over 2000 patients with stable
COPD, randomized to receive
sibenadet (500 microg) or placebo, pressurized
metered-dose inhaler (pMDI) (three times daily) for a period of 12 or 26 weeks. Diary cards were completed daily by patients throughout the study to record BCSS scores, peak expiratory flow (PEF), study
drug and rescue
bronchodilator usage, changes in concomitant medication and adverse events. The primary endpoints were defined as change from baseline to the final 4 weeks of the treatment period in mean BCSS total score, and forced expiratory volume in one second (FEV1) measured 1 hour after administration of the final dose of study
drug and expressed as a percentage of the predicted FEV1. In addition, clinic assessments were made to determine changes in pulmonary function, health-related quality of life, perception of treatment efficacy and adverse events. Despite initial improvements in mean daily BCSS total scores in patients receiving
sibenadet, the difference in the change from baseline to the final 4 weeks of the treatment period between the two treatment groups was neither statistically significant, nor considered to be of clinical importance. Although marked
bronchodilator activity was seen early on with
sibenadet treatment, the duration of effect diminished as the studies progressed.
Sibenadet use was not associated with any safety concerns. These studies, utilizing the novel BCSS, have clearly illustrated that, despite initial symptomatic improvement with
sibenadet therapy, this clinical benefit was not sustained over the course of the study.