Comparison of intravenous ibuterol (KWD 2058), a new bronchodilator, and terbutaline.

Abstract

The selectivity of the recently developed beta-stimulating drug ibuterol, a terbutaline ester which is rapidly hydrolyzed to terbutaline in vivo, was tested by comparing it with terbutaline after intravenous infusion. Dose-response curves for both drugs for FEV, heart rate, blood pressure, and tremor were recorded. The two drugs had equal bronchodilator effect. Ibuterol caused significantly less increase in heart rate, tremor ratio, and pulse amplitude when doses causing equal bronchodilation were infused. This is probably due to inequality of distribution. The lower tremorogenic activity of ibuterol can also be caused by differences in the concentration of tissue esterases in lung and skeletal muscle. It is concluded that ibuterol is more selective for the bronchi than terbutaline.

• Authors: S Larsson, N Svedmyr
• Journal: European journal of clinical pharmacology (Eur J Clin Pharmacol) Vol. 11 Issue 6 Pg. 429-33 (Jul 19 1977) ISSN: 0031-6970 [Print] Germany
• PMID: 891586 (Publication Type: Comparative Study, Journal Article)

Chemical References

• Bronchodilator Agents
• Terbutaline

Topics

• Adult
• Blood Pressure (drug effects)
• Bronchial Diseases (physiopathology)
• Bronchodilator Agents
• Dose-Response Relationship, Drug
• Forced Expiratory Volume
• Heart Rate (drug effects)
• Humans
• Infusions, Parenteral
• Male
• Terbutaline (administration & dosage, analogs & derivatives, pharmacology)
• Tremor (chemically induced)