RT Journal Article SR Electronic T1 Should theophyllines be sold over the counter? JF Drug and Therapeutics Bulletin JO Drug Ther Bull FD BMJ Publishing Group Ltd SP 99 OP 100 DO 10.1136/dtb.30.25.99 VO 30 IS 25 YR 1992 UL http://dtb.bmj.com/content/30/25/99.abstract AB Theophylline preparations are difficult to use. Ideally doses should be adjusted to give a plasma theophylline concentration in the therapeutic range.1 This goal can be achieved when the drug is prescribed by a doctor and plasma levels are regularly measured.2 Problems could arise when these drugs are bought over the counter. This article discusses how difficulties can be avoided.