Influence of chronic dosing on theophylline clearance.

Abstract:

:Theophylline clearance was studied in normal healthy volunteers before and after chronic oral dosing. Oral theophylline clearance showed a significant decrease (P less than 0.001) from 59.3 +/- 6.48 ml/min (mean +/- s.e. mean, n = 10) to 48.0 +/- 6.4 ml/min. Steady-state intravenous clearance decreased by 26 +/- 2% from 55.1 +/- 7.7 ml/min to 41.0 +/- 5.96 ml/min (mean +/- s.e. mean, n = 6; P less than 0.001) at constant steady-state intravenous test concentrations (mean 15.0 +/- 1.6 micrograms/ml after chronic oral dosing), excluding significant concentration dependence. Extrapolation of acute clearance findings to maintenance requirement may not be valid even in the same individual, with theophylline therapy requiring on-going review beyond acute stabilisation.

journal_name

Br J Clin Pharmacol

authors

Efthimiou H,Morgan DJ,Ioannides-Demos L,Raymond K,McLean AJ

doi

10.1111/j.1365-2125.1984.tb02385.x

subject

Has Abstract

pub_date

1984-05-01 00:00:00

pages

525-30

issue

5

eissn

0306-5251

issn

1365-2125

journal_volume

17

pub_type

杂志文章
  • The effect of ranitidine on the plasma clearance and hepatic extraction of indocyanine green in patients with chronic liver disease.

    abstract::Since hepatic clearance of ICG is reduced by H2-receptor antagonists in normal subjects, it has been suggested that they reduce liver blood flow. We have studied the effect of intravenous ranitidine on ICG clearance in twelve patients with chronic liver disease. Wedged and free hepatic venous pressure were measured be...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章

    doi:10.1111/j.1365-2125.1983.tb04973.x

    authors: Dunk AA,Jenkins WJ,Burroughs AK,Walt RP,Osuafor TO,Sherlock S,Mackie S,Dick R

    更新日期:1983-08-01 00:00:00

  • Drug induced liver injury with analysis of alternative causes as confounding variables.

    abstract:AIMS:Drug-induced liver injury (DILI) is rare compared to the worldwide frequent acute or chronic liver diseases. Therefore, patients included in series of suspected DILI are at high risk of not having DILI, whereby alternative causes may confound the DILI diagnosis. The aim of this review is to evaluate published case...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章,评审

    doi:10.1111/bcp.13593

    authors: Teschke R,Danan G

    更新日期:2018-07-01 00:00:00

  • Clinically important drug-drug interactions in poly-treated elderly outpatients: a campaign to improve appropriateness in general practice.

    abstract:AIMS:The aim was to assess the impact of a campaign for general practitioners (GPs) to reduce clinically-important drug-drug interactions (DDIs) in poly-treated elderly patients. METHODS:We compiled a list of 53 DDIs and analyzed reimbursed prescriptions dispensed to poly-treated (≥four drugs) elderly (>65 years) pati...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章

    doi:10.1111/bcp.12754

    authors: Raschi E,Piccinni C,Signoretta V,Lionello L,Bonezzi S,Delfino M,Di Candia L,Di Castri L,Pieraccini F,Carati D,Poluzzi E,De Ponti F,Emilia-Romagna elderly poly-treated patients research group.

    更新日期:2015-12-01 00:00:00

  • Initial therapy, persistence and regimen change in a cohort of newly treated type 2 diabetes patients.

    abstract:AIMS:The aim was to describe the utilization of antidiabetic agents, in terms of persistence and regimen change, in the management of a cohort of newly treated type 2 diabetes patients and to investigate associated socio-demographic and treatment factors. METHODS:A population-based retrospective cohort study was condu...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章

    doi:10.1111/bcp.12573

    authors: Grimes RT,Bennett K,Tilson L,Usher C,Smith SM,Henman MC

    更新日期:2015-06-01 00:00:00

  • Identification of human liver cytochrome P450 isoforms mediating secondary omeprazole metabolism.

    abstract::1. The in vitro metabolism of omeprazole was studied in human liver microsomes in order to define the secondary metabolic pathways and identify the cytochrome P450 (CYP) isoforms responsible for the formation of the secondary metabolites of omeprazole. 2. The major secondary omeprazole metabolite was the hydroxysulpho...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章

    doi:10.1111/j.1365-2125.1994.tb04310.x

    authors: Andersson T,Miners JO,Veronese ME,Birkett DJ

    更新日期:1994-06-01 00:00:00

  • Erythropoietin doping in cycling: lack of evidence for efficacy and a negative risk-benefit.

    abstract::Imagine a medicine that is expected to have very limited effects based upon knowledge of its pharmacology and (patho)physiology and that is studied in the wrong population, with low-quality studies that use a surrogate end-point that relates to the clinical end-point in a partial manner at most. Such a medicine would ...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章,评审

    doi:10.1111/bcp.12034

    authors: Heuberger JA,Cohen Tervaert JM,Schepers FM,Vliegenthart AD,Rotmans JI,Daniels JM,Burggraaf J,Cohen AF

    更新日期:2013-06-01 00:00:00

  • Do selected drugs increase the risk of lupus? A matched case-control study.

    abstract:AIM:To investigate the association between risk of lupus and exposure to selected drugs implicated in risk of lupus in a number of case reports. METHODS:In this matched nested case-control study we utilized primary care data from the UK General Practice Research Database recorded between 1987 and 2001. Cases with at l...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章

    doi:10.1111/j.1365-2125.2010.03733.x

    authors: Schoonen WM,Thomas SL,Somers EC,Smeeth L,Kim J,Evans S,Hall AJ

    更新日期:2010-10-01 00:00:00

  • Induction of P-glycoprotein in lymphocytes by carbamazepine and rifampicin: the role of nuclear hormone response elements.

    abstract:AIMS:Carbamazepine (CBZ) is an inducer of cytochrome P450 enzymes, which have been implicated in many drug interactions. However, for immunosuppressant and anti-HIV drugs, whose main site of action is the lymphocyte, induction of P-glycoprotein (Pgp) may also be important. In this study, we have investigated whether CB...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章

    doi:10.1111/j.1365-2125.2006.02587.x

    authors: Owen A,Goldring C,Morgan P,Park BK,Pirmohamed M

    更新日期:2006-08-01 00:00:00

  • Adverse reactions to procainamide.

    abstract::1 Data from a comprehensive drug surveillance programme are analysed to provide details of procainamide use and toxicity in medical wards of teaching hospitals in five countries. 2 Out of a total of 488 recipients 9.2% had one or more adverse effect attributed to the drug; common effects being arrhythmias, gastro-inte...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章

    doi:10.1111/j.1365-2125.1977.tb00777.x

    authors: Lawson DH,Jick H

    更新日期:1977-10-01 00:00:00

  • The metabolism of mexiletine in relation to the debrisoquine/sparteine-type polymorphism of drug oxidation.

    abstract::1. The relationship between the metabolism of the antiarrhythmic drug mexiletine and the debrisoquine/sparteine-type polymorphism was studied in vitro, using microsomes from six human livers, and in vivo, in nine healthy drug-free volunteers with wide variation in their ability to hydroxylate debrisoquine. 2. There wa...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章

    doi:10.1111/j.1365-2125.1991.tb03931.x

    authors: Broly F,Vandamme N,Libersa C,Lhermitte M

    更新日期:1991-10-01 00:00:00

  • Effects of age, sex and the oral contraceptive on the platelet membrane fibrinogen binding site (glycoprotein IIb/IIIa).

    abstract::1. We have studied the effects of age, sex and the oral contraceptive pill on platelet fibrinogen 'receptor' density (Bmax) and affinity (Kd). 2. [125I]-fibrinogen binding to gel-filtered platelets was assessed after stimulation with adenosine 5-diphosphate (ADP) and thrombin in 60 normal subjects; 37 females and 23 m...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章

    doi:10.1111/j.1365-2125.1992.tb03994.x

    authors: Cahill M,Mistry R,Chapman C,Wood JK,Barnett DB

    更新日期:1992-01-01 00:00:00

  • Effect of allopurinol on caffeine disposition in man.

    abstract::Caffeine (5 mg kg-1) was administered orally to two healthy, non-smoking subjects on three separate occasions--before, and during therapy with the xanthine oxidase inhibitor allopurinol at doses of either 300 or 600 mg daily. Plasma and urinary levels of methylxanthines, endogenous oxypurines and allopurinol and its m...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章

    doi:10.1111/j.1365-2125.1986.tb05222.x

    authors: Grant DM,Tang BK,Campbell ME,Kalow W

    更新日期:1986-04-01 00:00:00

  • Inhibition of artificially induced cough in man by bronchodilators.

    abstract::1. The antitussive properties of bronchodilators were evaluated in a total of 47 normal volunteers. 2. Cough was induced by inhalation of ultrasonically nebulized solutions of distilled water and hypotonic saline. 3. Inhaled fenoterol hydrobromide (360 micrograms; 20 volunteers) and inhaled ipratropium bromide (72 mic...

    journal_title:British journal of clinical pharmacology

    pub_type: 临床试验,杂志文章,随机对照试验

    doi:10.1111/j.1365-2125.1987.tb03204.x

    authors: Lowry R,Higenbottam T,Johnson T,Godden D

    更新日期:1987-10-01 00:00:00

  • First-in-human study of the safety, tolerability, pharmacokinetics and pharmacodynamics of single and multiple oral doses of SAR247799, a selective G-protein-biased sphingosine-1 phosphate receptor-1 agonist for endothelial protection.

    abstract:AIMS:SAR247799 is a selective G-protein-biased sphingosine-1 phosphate receptor-1 (S1P1 ) agonist with potential to restore endothelial function in vascular pathologies. SAR247799, a first-in-class molecule differentiated from previous S1P1 -desensitizing molecules developed for multiple sclerosis, can activate S1P1 wi...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章

    doi:10.1111/bcp.14422

    authors: Bergougnan L,Armani S,Golor G,Tardat A,Vitse O,Hurbin F,Scemama M,Poitiers F,Radzik D,Gaudin C,Hovsepian L,Muslin AJ,Kirkesseli S,Deutsch P,Parkar AA

    更新日期:2020-06-10 00:00:00

  • Biopsy assessment of drug efficacy in the gastrointestinal tract.

    abstract::When using biopsy pathology in clinical pharmacology to assess drug efficacy in the gastrointestinal tract, a number of questions must be answered: Is the biopsy necessary or more effective than macroscopic views by endoscopy? Can we extract maximal information from the specimen? Are there surrogate serum or other mar...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章,评审

    doi:10.1046/j.1365-2125.2003.01981.x

    authors: Walker MM

    更新日期:2003-11-01 00:00:00

  • Effects of xamoterol on resting and exercise haemodynamics in patients with chronic heart failure.

    abstract::1. A bicycle exercise test was used to investigate functional capability and haemodynamics in 30 patients with heart failure (13 NYHA Class II, 17 Class III), before and after i.v. xamoterol (Corwin, Carwin, Corwil, Xamtol, ICI 118,587) 0.2 mg kg-1. 2. Resting heart rate fell from 78 to 74 beats min-1 (P less than 0.0...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章

    doi:

    authors: Virk SJ,Davies MK

    更新日期:1989-01-01 00:00:00

  • Pharmacokinetic and pharmacodynamic profile of donepezil HCl following evening administration.

    abstract:AIMS:The primary objective of this study was to characterize the pharmacokinetics and pharmacodynamics of single daily doses of donepezil (5 and 10 mg) each evening for 28 consecutive days. A secondary objective was to measure the plasma protein binding of donepezil at steady state. METHODS:This was a double-blind, ra...

    journal_title:British journal of clinical pharmacology

    pub_type: 临床试验,杂志文章,随机对照试验

    doi:10.1046/j.1365-2125.1998.0460s1013.x

    authors: Tiseo PJ,Rogers SL,Friedhoff LT

    更新日期:1998-11-01 00:00:00

  • Population pharmacokinetics of human antithrombin concentrate in paediatric patients.

    abstract:AIMS:Antithrombin is increasingly used in paediatric patients, yet there are few age-specific pharmacokinetic data to guide dosing. We aimed to describe the pharmacokinetic profile of human (plasma-derived) antithrombin concentrate in paediatric patients. METHODS:A 5-year retrospective review was performed of patients...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章

    doi:10.1111/bcp.13359

    authors: Moffett BS,Diaz R,Galati M,Mahoney D,Teruya J,Yee DL

    更新日期:2017-11-01 00:00:00

  • Management of Helicobacter pylori eradication--the influence of structured counselling and follow-up.

    abstract:AIMS:Helicobacter pylori (H. pylori) eradication rate varies according to the treatment regimen used and other factors, e.g. antimicrobial resistance and patient compliance. The aim of the present study was to evaluate the influence of patient counselling and follow-up on H. pylori eradication rates and to document the...

    journal_title:British journal of clinical pharmacology

    pub_type: 临床试验,杂志文章,随机对照试验

    doi:10.1046/j.0306-5251.2001.01531.x

    authors: Al-Eidan FA,McElnay JC,Scott MG,McConnell JB

    更新日期:2002-02-01 00:00:00

  • Ranitidine influences the uptake of oral midazolam.

    abstract::In a randomised crossover study in volunteers plasma midazolam levels were estimated for 24 h following 15 mg by mouth, either preceded by no medication or following 24 h therapy with ranitidine. Administration of the H2-receptor blocker significantly increased bioavailability of the benzodiazepine and resulted in hig...

    journal_title:British journal of clinical pharmacology

    pub_type: 临床试验,杂志文章,随机对照试验

    doi:10.1111/j.1365-2125.1983.tb01559.x

    authors: Elwood RJ,Hildebrand PJ,Dundee JW,Collier PS

    更新日期:1983-06-01 00:00:00

  • Comparison of different dose regimes of aminohydroxypropylidene-1,1-bisphosphonate (APD) in hypercalcaemia of malignancy.

    abstract::1. The new intravenous bisphosphonate drug aminohydroxypropylidine bisphosphonate (APD) is effective in treating the hypercalcaemia of malignant disease, but the optimum dose regimen is not yet established. We have treated twenty-seven patients with malignant hypercalcaemia (corrected calcium greater than 3.00 mmol l-...

    journal_title:British journal of clinical pharmacology

    pub_type: 临床试验,杂志文章,随机对照试验

    doi:10.1111/j.1365-2125.1989.tb05426.x

    authors: Davis JR,Heath DA

    更新日期:1989-09-01 00:00:00

  • Early QT assessment--how can our confidence in the data be improved?

    abstract::Exposure-response (ER) analysis has emerged as an important tool to interpret QT data from thorough QT (TQT) studies and allows the prediction of effects in the targeted patient population. Recently, ER analysis has also been applied to data from early clinical pharmacology studies, such as single and multiple ascendi...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章,评审

    doi:10.1111/bcp.12068

    authors: Darpo B,Garnett C

    更新日期:2013-11-01 00:00:00

  • A controlled trial of labetalol (Trandate), propranolol and placebo in the management of mild to moderate hypertension.

    abstract::1. Labetalol, a new drug combining alpha-and beta-adrenoceptor blocking properties, has been compared with placebo in a double-blind crossover study of a group of patients with mild to moderate essential hypertension (blood pressure 150/100 to 189/114 mmHg). 2. Labetalol and propranolol lowered blood pressure satisfac...

    journal_title:British journal of clinical pharmacology

    pub_type: 临床试验,杂志文章,随机对照试验

    doi:10.1111/j.1365-2125.1979.tb00898.x

    authors: Pugsley DJ,Nassim M,Armstrong BK,Beilin L

    更新日期:1979-01-01 00:00:00

  • Fat preload delays gastric emptying: reversal by cisapride.

    abstract::1. Meals empty more slowly when they contain fat. 2. This study investigated whether an intragastric fat preload in comparison with a water preload affected gastric emptying of a semisolid meal and antral motor activity, and whether cisapride reversed such effects. 3. Twelve healthy subjects were studied under three c...

    journal_title:British journal of clinical pharmacology

    pub_type: 临床试验,杂志文章,随机对照试验

    doi:10.1111/j.1365-2125.1990.tb05449.x

    authors: Stacher G,Bergmann H,Gaupmann G,Schneider C,Kugi A,Höbart J,Binder A,Mittelbach-Steiner G

    更新日期:1990-12-01 00:00:00

  • Beta-adrenoceptor responsiveness in hypertension: effects of dietary NaCl intake.

    abstract::1. Adrenergic responsiveness may be an important determinant of peripheral resistance in man. We have demonstrated that vascular beta-adrenergic responsiveness is reduced in young borderline hypertensive subjects. A parallel defect in beta-adrenergic mediated adenylyl cyclase activity and beta-adrenoceptor affinity fo...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章,评审

    doi:10.1111/j.1365-2125.1990.tb05469.x

    authors: Feldman RD

    更新日期:1990-01-01 00:00:00

  • Inhibition of gastric secretion following single morning or twice daily oral administration of sufotidine to volunteers.

    abstract::1. The inhibitory effect of sufotidine, a new histamine H2-receptor antagonist, on gastric secretion of acid and pepsin was studied in six healthy male volunteers. This was a three-way, cross-over, randomized, double-blind study. On each of 3 study days, the drug in a dose of 600 mg, or placebo, was administered eithe...

    journal_title:British journal of clinical pharmacology

    pub_type: 临床试验,杂志文章,随机对照试验

    doi:10.1111/j.1365-2125.1989.tb03519.x

    authors: Johnston DA,Wormsley KG

    更新日期:1989-10-01 00:00:00

  • Topical minoxidil: cardiac effects in bald man.

    abstract::Systemic cardiovascular effects during chronic treatment with topical minoxidil vs placebo were evaluated using a double-blind, randomized design for two parallel groups (n = 20 for minoxidil, n = 15 for placebo). During 6 months of follow-up, blood pressure did not change, whereas minoxidil increased heart rate by 3-...

    journal_title:British journal of clinical pharmacology

    pub_type: 临床试验,杂志文章,随机对照试验

    doi:10.1111/j.1365-2125.1988.tb03410.x

    authors: Leenen FH,Smith DL,Unger WP

    更新日期:1988-10-01 00:00:00

  • In vitro and in vivo evaluation of the inhibition potential of risperidone toward clozapine biotransformation.

    abstract:AIMS:To study the impact of risperidone (RISP) on clozapine (CLZ) biotransformation in vitro in microsomal fractions containing varying expression of CYP oxidases and in vivo in patients. METHODS:Human liver microsomes (n= 11) were assessed for expression of CYPs 1A2, 2D6 and 3A4, because these enzymes mediate RISP an...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章,多中心研究

    doi:10.1111/j.1365-2125.2009.03476.x

    authors: Chetty M,d'Esposito F,Zhang WV,Glen J,Dore G,Stankovic Z,Edwards RJ,Ramzan I,Murray M

    更新日期:2009-10-01 00:00:00

  • Inhibition of vasoconstriction by potassium channel opener aprikalim in human conduit arteries used as bypass grafts.

    abstract:AIMS:Potassium channel openers (KCOs) are of potential therapeutic value. Little is known about the effect of these drugs on human conduit arteries used as coronary bypass grafts. The purpose of this study was to determine the effect of the KCO aprikalim (RP52891) on human arteries used as coronary bypass grafts with e...

    journal_title:British journal of clinical pharmacology

    pub_type: 杂志文章

    doi:10.1046/j.1365-2125.1997.00640.x

    authors: He GW,Yang CQ

    更新日期:1997-10-01 00:00:00

  • The bronchodilator effect of NAB 365.

    abstract::1. Dose response relationships for salbutamol and a new bronchodilator drug NAB 365 have been obtained in patients with reversible airways obstruction. These show that the latter is about one hundred times more potent than the former. 2. NAB 365 has a very long half-life. The implications of this are discussed. ...

    journal_title:British journal of clinical pharmacology

    pub_type: 临床试验,杂志文章,随机对照试验

    doi:10.1111/j.1365-2125.1977.tb00669.x

    authors: Kamburoff PL,Prime FJ,Schmidt OP

    更新日期:1977-02-01 00:00:00