Fourteen patients with nocturnal asthma were recruited to a two period crossover trial which compared a run-in period on nightly salbutamol (200 micrograms) with a period on nightly ipratropium bromide (160 micrograms) and a period on nightly salbutamol plus ipratropium at night. Morning dipping, as assessed by the fall in peak flow overnight, was significantly reduced in the periods when ipratropium bromide was taken. Peak flow in the morning and also at night was improved when taking ipratropium bromide. Ipratropium bromide in adequate dosage appears to be effective in reducing morning dipping in asthma.
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