[Salmeterol and prolonged treatment of asthma: international clinical data]

Salmeterol is an original molecule with a selective-beta-2-sympathomimetic effect which is intended to a prolonged treatment of asthma. This inhaled preparation has a long duration of action which points to its use on a BID regimen. Results of the phase III development has been assessed in 2,277 subjects. Salmeterol administered at a dose of 50 micrograms morning and evening results in a marked increase in FEV1, which remains superior to 15% by comparison with baseline 12 hours after the last dose in the majority of subjects. In the specific case of more severe asthma (FEV1 less than 50% of predicted), the use of 100 micrograms morning and evening allows for an extra-improvement in FEV1. In the majority of studies, salmeterol has resulted in an almost complete remission of the clinical symptomatology: disappearance or major diminution in the use of inhaled salbutamol administered as a rescue medication on a PRN basis (during the day and at night) and of nocturnal awakenings, global improvement of clinical scores. Daily peak expiratory flow rates (morning and night values) are considerably improved (greater than or equal to 50 l/min) with a significant reduction of daily swings. Lung function tests are also very significantly improved. Salmeterol has proved to be largely superior to the comparison medications, salbutamol taken at a dose of 200 micrograms four times a day, and optimal therapy with theophylline. Clinical acceptability of salmeterol is good and is not different from salbutamol.