A double blind crossover trial with active or placebo slow release theophylline (Slo-phyllin) in children with asthma aged up to 4 years is described. Although no difference in symptom scores was shown, other differences in favour of active treatment were noted. We conclude that this preparation is of benefit in the management of the wheezing preschool child. The value of symptom scores as an index of clinical improvement is discussed.
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