Formoterol, a new long-acting beta 2 agonist, inhaled twice daily, in stable asthmatic subjects

Midgren, B.; Melander, B.; Persson, G.

Chest 101(4): 1019-1022

1992


ISSN/ISBN: 0012-3692
PMID: 1348219
Accession: 007359282

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Abstract
Study objective. To determine whether formoterol, a new .beta.2 agonist with experimentally documented long duration, is clinically more effective than salbutamol in the maintenance treatment of chronic asthma. Design: Randomized double-blind between-patient comparison between treatment with formoterol and with salbutamol during four weeks. Setting: Asthma/allergy department in a university hospital. Thirty-seven patients with chronic stable asthma, who during a two-week run-in period with inhaled salbutamol, 4 .times. 100 .mu.g twice a day, used at least four additional doses (100 .mu.g each) daily, were randomly assigned to use either formoterol or salbutamol. Thirty-five patients were evaluated for efficacy. One early withdrawal and one dropout were found in the salbutamol group. The groups were similar with respect to demographic data and baseline lung function. Interventions: During the four-week study period, the patients used either formoterol (4 .times. 6 .mu.g twice a day and as necessary, n = 19) or salbutamol (4 .times. 100 .mu.g twice a day and as necessary, n = 16). Inhaled steroids and orally administered theophylline were allowed if doses were kept constant. Measurements and main results: The median number of additional doses per 24 h (median of two weeks) of the test aerosols was 0 (range, 0 to 6) for formoterol and 4 (range, 0 to 14) for salbutamol (p<0.01). Morning and evening PEFRs were 422 (SEM=31) and 443 (SEM=30), respectively, for formoterol, and 335 (SEM=30) and 360 (SEM-26), respectively, for salbutamol (p=0.05 for both). Formoterol was superior (p<0.05) to salbutamol with respect to control of asthma symptoms, estimated duration of action and patient preference. Side effects did not differ. Conclusions: Inhaled formoterol administered twice a day and as necessary was clinically more effective than the same regimen of salbutamol.