the bronchodilating effect , circulatory effects , and subjective side effects of ibuterol hydrochloride , the di-isobutyric acid ester of terbutaline , at two dose levels ( 2 and 4 mg ) were compared with those of 5 mg terbutaline sulphate in a double-blind cross-over study on 12 patients with asthma .
C0039542
terbutaline
C0004096
asthma