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Bronchodilator combinations in animals and in man.

M J Mattila, R O Salonen, E M Ruotsalainen

Annals of Clinical Research

|January 1, 1985

Summary

Pirbuterol, a beta 2-agonist, and theophylline showed additive bronchodilation in rats. In asthmatic patients, pirbuterol combinations were as effective as ephedrine combinations, suggesting beta 2-agonists may not be superior to ephedrine.

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Area of Science:

Pharmacology
Respiratory Medicine

Background:

Bronchodilator therapy is crucial for managing asthma.
Beta 2-agonists and theophylline are common bronchodilators.
Investigating drug combinations is essential for optimizing asthma treatment.

Purpose of the Study:

To evaluate the combined bronchodilator effects of pirbuterol (a beta 2-agonist) and theophylline.
To compare the efficacy of pirbuterol-based combinations with ephedrine-based combinations in asthmatic patients.

Main Methods:

Studies were conducted in anesthetized rats and asthmatic outpatients.
Methacholine-induced bronchoconstriction was measured in rats.
Bronchodilator efficacy was assessed in human subjects using drug combinations and placebo.

Main Results:

Pirbuterol was more effective than aminophylline in reducing methacholine-induced bronchoconstriction in rats, without causing hypotension.
The combination of pirbuterol and theophylline demonstrated additive bronchodilatation in rats.
In asthmatic patients, pirbuterol + theophylline + hydroxyzine was as effective as ephedrine + theophylline + hydroxyzine, and both differed significantly from placebo.

Conclusions:

Pirbuterol and theophylline exhibit additive bronchodilator effects.
Beta 2-agonists like pirbuterol may not offer superior efficacy over ephedrine in combination therapies for asthma.
Combination therapy including a beta 2-agonist or ephedrine, theophylline, and hydroxyzine is effective in asthmatic patients.

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