Although the diuretic and natriuretic effects of the methylxanthines caffeine and theophylline are well established, the mechanisms responsible for these effects are unclear and may be related to inhibition of phosphodiesterases and/or antagonism of adenosine receptors. With regard to the latter, pharmacological blockade of A1 receptors can induce diuresis and natriuresis by inhibition of proxi...

It has been recognized recently that theophylline possesses anti-inflammatory effects that could be of clinical interest in patients with airway inflammatory diseases such as asthma and allergic rhinitis (AR). The aim of the present study was to explore the effect of theophylline on the nasal eosinophilic inflammatory response following allergen challenge in patients with AR. Fourteen subjects ...

Some fluoroquinolone antibiotics interfere with theophylline clearance, thereby raising concentrations of circulating theophylline and increasing the potential for toxicity. The effect of steady-state serum concentrations of the new fluoroquinolone trovafloxacin on the steady-state pharmacokinetics of theophylline was examined in 12 healthy male volunteers. For 7 days, the subjects received mor...

The plasma theophylline concentrations produced by 4 different slow release formulations, Theograd, Theodur, Theolair-SR and Rona-slophylline were measured over a 24-hr period in 8 healthy subjects. All 4 preparations maintained plasma levels over 12 hr and had similar AUC values when the difference in theophylline content was taken into account. Paired saliva and plasma theophylline concentrat...

Correspondence: *Inserm U408, Unité de Pneumologie de l'Hôpital Bichat, Paris, France. ** and Dept of Thoracic Medicine, National Heart and Lung Institute, London, UK. This issue of the European Respiratory Journal starts a series of short reviews based on a Satellite Meeting held during the European Respiratory Society Annual Meeting in Nice in October 1994. The symposium was supported by Byk ...

In an era moving towards digital health, 3D printing has successfully proven its applicability in providing personalised medicine through a technology-based approach. Among the different techniques, direct extrusion been demonstrated as promising approach for on demand manufacturing of solid dosage forms. However, it usually requires use elevated temperatures and/or incorporation evaporable sol...

In a double-blind cross-over study, the effects of slow release (S-R) terbutaline tablets (b.i.d. 0.25 mg/kg per day) and S-R theophylline (5.31 mg/kg morning and 10.62 mg/kg evening) were compared in eleven patients with nocturnal asthma. On day seven of each treatment period, drug serum concentrations and peak expiratory flow (PEF) were measured every 2h over a 24-h period. During daytime, te...

Theophylline enhances the force of diaphragmatic contraction and delays fatigue. The mechanism is not known, but recent evidence suggests it may act at the cell membrane. To test this hypothesis, we studied the effect of theophylline on resting membrane potential and tension in hamster diaphragm cells. Muscle strips were obtained from five adult hamsters and placed in Krebs solution, aerated wi...

The objective of the present study was to determine if patients with COPD who were taking Theo-Dur bid or tid (total dose 400 to 900 mg per day) could be safely switched to Uni-Dur, 800 mg given qd at bedtime. Twenty-eight patients were enrolled in the study, and 23 completed the study. The mean daily dose of theophylline prior to the study was 828 mg, while the mean dose after three weeks of U...

BACKGROUND Theophylline is a nonspecific inhibitor of phosphodiesterases that, despite exerting bronchodilator and anti-inflammatory effects, is a third-line therapy rarely used to treat chronic airflow limitation. We wished to evaluate the efficacy of oral theophylline as measured by improvements in trough (pre-dose) or peak (post-dose) FEV1 and FVC in patients with clinically stable COPD. D...