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  • enzyme induction  (2)
  • Acid secretion  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 63 (1985), S. 1152-1159 
    ISSN: 1432-1440
    Schlagwort(e): Duodenal ulcer healing ; Acid secretion ; Cimetidine pharmacokinetics ; Treatment response
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In a prospective trial 37 duodenal ulcer patients were treated daily with 1 g cimetidine. Personal and clinical data were obtained for all patients, acid secretion studies performed before and during treatment, and pharmacokinetic parameters of cimetidine determined. The healing rate after 4 weeks was 64.9% (24 patients). Non-Responders included a higher proportion of smokers, patients with a history of ulcer and previous treatment with H2-receptor antagonists than Responders. Basal acid output (BAO) and peak acid output (PAO) values were not different between the two groups, nor was the reduction of BAO and PAO under cimetidine. However, more Responders had complete suppression of BAO than Non-Responders. A correlation existed in both groups between cimetidine plasma concentration and PAO suppression but not with BAO suppression. Regular drug intake (compliance) was found in about 90% in both groups. Cimetidine bioavailability parameters were identical in both groups, but Non-Responders had a higher peak concentration and a shorter time of peak concentration. Discriminant analysis enabled a prediction of treatment response in 89.2% of the patients by using five factors: time of peak concentration of cimetidine, previous H2-receptorantagonist treatment, peak concentration, smoking, and alcohol use. Prediction of treatment response is increased by use of drug related variables.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 19 (1981), S. 343-347 
    ISSN: 1432-1041
    Schlagwort(e): cimetidine ; phenobarbital ; gastro-intestinal absorption ; bioavailability ; renal clearance ; non-renal clearance ; enzyme induction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary The pharmacokinetics of orally administered cimetidine was studied in 8 healthy subjects before and after 3 weeks of treatment with phenobarbital 100 mg daily, and in a separate study 4 subjects received cimetidine intravenously before and after the administration of phenobarbital. There was no change in the volume of distribution, but total plasma clearance was increased by a mean of 18%, mainly due to a 37% increase in nonrenal clearance. Renal clearance and half-life were not significantly altered. The area under the plasma concentration-time curve after oral administration was significantly (P≪0.05) reduced by a mean of 15% after phenobarbital treatment. The amount of cimetidine excreted in urine and its sulphoxide metabolite were significantly (P〈0.05) reduced, on average by 34% and 26%, respectively by phenobarbital treatment. The data indicate that an apparent 20% reduction in the absorption of cimetidine was due to induction of gastrointestinal metabolism of cimetidine, with some contribution also from hepatic metabolism. Reduced absorption per se could not be totally excluded. Although the magnitude of the change was small, the finding of an 11% decrease in the time to achieve an effective plasma level of cimetidine after phenobarbital treatment may contribute to the ineffectiveness of cimetidine in certain patients.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 51 (1973), S. 1081-1090 
    ISSN: 1432-1440
    Schlagwort(e): Anticoagulants ; coumarins ; drug interaction ; protein binding ; enzyme induction ; enzyme inhibition ; Antikoagulantien ; Cumarine ; Arneimittelwechselwirkung ; Interaktion ; Eiweißbindung ; Enzyminduktion ; Enzymhemmung
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Eine große Zahl von Medikamenten tritt bei gleichzeitiger Gabe in Interaktion mit Cumarinderivaten. Wesentliche Mechanismen sind dabei Resorptionshemmung, Verdrängung aus der Plasmaeiweißbindung, Hemmung oder Induktion des metabolisierenden Enzymsystems sowie Beeinflussung von Synthese oder Abbau der Vitamin Kabhängigen Gerinnungsfaktoren. Auch die Cumarine selbst sind in der Lage, die Metabolisierung anderer Pharmaka hemmend zu beeinflussen. Es ergibt sich die Notwendigkeit, neu einzuführende Medikamente auf die Interaktion mit Cumarinen zu testen. Eine sorgfältige Überwachung des Patienten ist bei Beginn oder Beendigung jeder Therapie mit einem in Kombination mit Cumarinen eingesetzten Pharmakon angezeigt.
    Notizen: Summary Many drugs are known to modify the pharmacological action of coumarin anticoagulants when administered simultaneously. Mechanisms of interaction may consist in inhibition of absorption, displacement from protein binding sites, inhibition or induction of drug metabolizing enzymes in liver microsomes, and effect on synthesis and metabolization of the vitamin K-dependent clotting factors. Coumarins also may inhibit the metabolic degradation of other drugs. It is therefore necessary to test new compounds for a possible interaction with coumarin agents. Patients treated with coumarin anticoagulants should be controled carefully for changes in the hypoprothrombinaemic action when additional drugs are given or when these are discontinued.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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