Therapy with nifedipine in asthma: a randomized double-blind crossover trial.

A randomized double-blind crossover trial with nifedipine (10 mg orally four times a day for 2 weeks) was carried out in 11 asthmatic patients. The analysis of the differences between the periods of running-in, placebo and nifedipine administration showed a mild improvement in symptom scores during the nifedipine period (2.8 +/- 1.5, 2.8 +/- 1.8 and 2.1 +/- 1.6, respectively; P less than 0.05). Drug intake and peak expiratory flow rates remained unchanged. This suggests that the drug did not influence the baseline bronchial tone, but might have attenuated some superimposed exacerbations due to unavoidable exposure to cold, effort or allergens. We conclude that the benefit of orally administered nifedipine in low doses has little value in the treatment of asthma.