International Journal of Clinical PracticeVolume 39, Issue 9 p. 341-345 Clinical Study The Efficacy of Sustained Release Theophylline (Pro-Vent), in Asthma P. J. Wallis BSc, MB, BS, MRCP, P. J. Wallis BSc, MB, BS, MRCP The London Hospital, Whitechapel Road, LondonSearch for more papers by this authorM. Joy BSc, M. Joy BSc The London Hospital, Whitechapel Road, London The Wellcome Research Laboratories, Beckenham, KentSearch for more papers by this authorD. T. D. Hughes BSc, MA, BM, BCh, FRCP, D. T. D. Hughes BSc, MA, BM, BCh, FRCP The London Hospital, Whitechapel Road, LondonSearch for more papers by this authorD. W. Empey MB, BS, MRCS, FRCP, D. W. Empey MB, BS, MRCS, FRCP The London Hospital, Whitechapel Road, LondonSearch for more papers by this author P. J. Wallis BSc, MB, BS, MRCP, P. J. Wallis BSc, MB, BS, MRCP The London Hospital, Whitechapel Road, LondonSearch for more papers by this authorM. Joy BSc, M. Joy BSc The London Hospital, Whitechapel Road, London The Wellcome Research Laboratories, Beckenham, KentSearch for more papers by this authorD. T. D. Hughes BSc, MA, BM, BCh, FRCP, D. T. D. Hughes BSc, MA, BM, BCh, FRCP The London Hospital, Whitechapel Road, LondonSearch for more papers by this authorD. W. Empey MB, BS, MRCS, FRCP, D. W. Empey MB, BS, MRCS, FRCP The London Hospital, Whitechapel Road, LondonSearch for more papers by this author First published: 01 September 1985 https://doi.org/10.1111/j.1742-1241.1985.tb07855.xCitations: 1Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Citing Literature Volume39, Issue9September 1985Pages 341-345 RelatedInformation