Abstract:
:The bioavailability of three different theophylline tablets (microcrystallinic theophylline, Theolair, Nuelin, 3M Riker), choline theophyllinate as a new film-coated tablet (Teovent, Ferrosan, Sweden) and theophyllaminopropanol (Oxyphylline, Draco, Sweden) was investigated in eight adult asthmatics and a randomized, double-blind, cross-over study. Effects on ventilatory capacity (FEV1 and FVC), circulation (heart rate and blood pressure) and skeletal muscle tremor were followed. The theophylline concentration was determined by gas chromatography. Forty-five minutes after theophylline administration the plasma concentrations were almost the same for all four formulations. The bioavailability was also almost identical. The half-life for intravenous theophylline in these asthmatics was 7.4 +/- 0.64. The three tablet formation had equal effect on FEV1 and the effect was sustained throughout the 6-h period. Six hours after theophylline administration five terbutaline inhalations induced the same further increase in FEV1. The results indicate that theophylline alone has only a moderate acute bronchodilating effect at recommended plasma concentrations but gives a good effect when combined with inhaled beta 2-adrenostimulants.
journal_name
Allergyjournal_title
Allergyauthors
Svedmyr K,Mellstrand T,Svedmyr Ndoi
10.1111/j.1398-9995.1982.tb01884.xsubject
Has Abstractpub_date
1982-02-01 00:00:00pages
111-7issue
2eissn
0105-4538issn
1398-9995journal_volume
37pub_type
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