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  • drug interaction  (48)
  • Springer  (48)
  • American Chemical Society
  • Elsevier
  • 2000-2004
  • 1985-1989  (48)
Collection
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  • Springer  (48)
  • American Chemical Society
  • Elsevier
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 30 (1986), S. 351-353 
    ISSN: 1432-1041
    Keywords: theophylline ; viloxazine ; clearance ; drug interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary A case is reported of theophylline intoxication due to a dramatic decrease in theophylline clearance following concomitant administration of viloxazine.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 31 (1986), S. 371-374 
    ISSN: 1432-1041
    Keywords: oxaprozin ; drug interaction ; acetaminophen ; cimetidine ; ranitidine ; pharmacokinetics ; healthy volunteers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Twelve healthy male volunteers participated in a single-dose four-way crossover study to evaluate potential drug interactions with oxaprozin, a nonsteroidal antiinflammatory agent of the propionic class. The four modes of administration were:a. oxaprozin, 1200 mg alone;b. oxaprozin during concurrent acetaminophen, 500 mg 4 times daily;c. oxaprozin with cimetidine, 300 mg 4 times daily;d. oxaprozin with ranitidine, 150 mg every 12 hours. Acetaminophen, cimetidine, or ranitidine were begun 24 hours prior to oxaprozin dosage and continued for the 10-day duration of each trial. No significant differences existed among the four treatment conditions in peak plasma oxaprozin concentration (86 µg/ml), volume of distribution (0.23 l/kg), time of peak concentration (3.7 h after dosage), or elimination half-life (54 h). Oxaprozin oral clearance was significantly lower (by 20%) during both the cimetidine and ranitidine trials versus control (0.047 vs 0.047 vs 0.059 ml/min/kg), but clearance during acetaminophen was not significantly different from control. Thus acetaminophen, cimetidine or ranitidine has only a small influence on the pharmacokinetics of a single oral dose of oxaprozin. The reduction in oxaprozin clearance due to cimetidine or ranitidine is statistically significant but small in magnitude.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 34 (1988), S. 73-76 
    ISSN: 1432-1041
    Keywords: dapsone ; rifampicin ; clofazimine ; leprosy ; drug interaction ; multidrug therapy ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In leprosy patients in Nigeria the influence of daily clofazimine and of once-monthly rifampicin on the pharmacokinetics of dapsone has been investigated. Three days after rifampicin the elimination half-life of dapsone was reduced from 40.4 to 25.3 h (n=23). Correspondingly, the plasma dapsone 24 h after the last dose had fallen significantly from 2.63 to 2.02 mg/l. Clofazimine did not cause change in the pharmacokinetics of dapsone. It was concluded that, although rifamipicin had a considerable influence on the pharmacokinetics of dapsone, there is no reason to adjust the dose of dapsone during multidrug therapy of leprosy.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 35 (1988), S. 431-432 
    ISSN: 1432-1041
    Keywords: rifampicin ; enalapril ; hypertension ; drug interaction ; case report
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary When a 35-year-old man with essential hypertension was treated with antibiotics for brucellosis his blood pressure rose significantly. While all other treatment was kept constant rifampicin was discontinued. On rechallenge rifampicin did not alter serum concentrations of enalapril or the area under the curve (AUC) between 0 and 7 h, but it did reduce the AUC of the active metabolite enalaprilat by 31%. These observations suggest that there may be an interaction between rifampicin and enalapril, causing reduced hypotensive efficacy of enalapril. The mechanism of such an interaction merits further study, but it could be due to enhanced renal clearance of enalaprilat.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 35 (1988), S. 585-592 
    ISSN: 1432-1041
    Keywords: amitriptyline ; diazepam ; pharmacodynamics ; body sway ; psychomotor performance ; drug interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effects on psychomotor performance and attention of amitriptyline 75 mg administered without and with diazepam 10 mg have been investigated in 12 healthy subjects. The effects of the compounds were evaluated by objective tests (measurement of body sway, critical flicker fusion, visual reaction time, tachistoscopy, short term visual memory, tapping test, arithmetical calculation and Clement's code) and subjective measurements (visual analogue scales and side effects questionnaire). Measurements were taken before treatment and after 1, 3, 6, 8 and 24 h. Placebo did not affect either the objective or the subjective measurements. Diazepam caused a reduction in attention and performance after 1 h which had disappeared at 3 h. Amitriptyline caused a marked reduction in attention and performance, reaching a peak 3 hours after drug administration and persisting until 8 h. the deterioration in vigilance induced by amitriptyline was potentiated by concomitant diazepam.
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  • 6
    ISSN: 1432-1041
    Keywords: tolbutamide ; antipyrine ; selective inhibition ; metabolite formation ; pharmacokinetics ; drug interaction ; sulphaphenazole ; cimetidine ; primaquine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effects of sulphaphenazole, cimetidine and primaquine on the disposition of antipyrine and tolbutamide in healthy volunteers have been investigated. The model substrates were administered simultaneously in order more clearly to define any selective effects of the potential inhibitors. Sulphaphenazole produced a significant increase in the half-life of tolbutamide (7.10 to 21.50 h) and a correponding decrease in its clearance (0.260 to 0.084 ml·min−1·kg−1). Clearance to hydroxytolbutamide (OHTOL) and carboxytolbutamide (COOHTOL) was also significantly decreased. In contrast, sulphaphenazole had no effect on the disposition of antipyrine. Administration of cimetidine did not significantly alter the disposition of either model drug. However, a 1.6-times higher dose of cimetidine did increase the half lives both of tolbutamide and antipyrine (6.21 to 9.04 h and 14.2 to 19.2 h, respectively) and decrease their clearance (0.226 to 0.148 and 0.50 to 0.31 ml·min−1 kg−1, respectively). Clearance to OHTOL and hydroxymethylantipyrine (HMA) was reduced. A single dose of primaquine had no demonstrable effect on tolbutamide disposition whereas the half-life of antipyrine was increased (12.1 to 15.0 h) and its clearance decreased (0.63 to 0.38 ml·min−1·kg−1). The partial clearance to HMA, 4-hydroxyantipyrine (OHA) and norantipyrine (NORA) was also significantly reduced. The two main inferences are first, that tolbutamide and antipyrine are metabolished by different forms of cytochrome P-450, and second that a battery of model substrates is needed to investigate the inhibitory effects of a drug in man.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 31 (1986), S. 299-302 
    ISSN: 1432-1041
    Keywords: femoxetine ; cimetidine ; pharmacokinetics ; drug interaction ; healthy volunteers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The possibility of a pharmacokinetic interaction between femoxetine and cimetidine has been evaluated in 8 healthy volunteers. Two volunteers received single doses of femoxetine, and 6 were given multiple doses of femoxetine for 7 days with and without concurrent cimetidine. No influence of cimetidine was observed on the kinetics of single doses of femoxetine, but after multiple doses the plasma concentration of femoxetine was significantly increased. Similarly, the AUC at steady state tended to be increased, but not to a significant extent. Concurrent cimetidine did not cause a reduction in the AUC of the active desmethyl metabolite. It is recommended that femoxetine is given in reduced doses (e.g. 400 mg) when administered with cimetidine.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 28 (1985), S. 433-437 
    ISSN: 1432-1041
    Keywords: isofezolac ; probenecid ; pharmacokinetics ; anti-inflammatory drug ; drug interaction ; healthy volunteers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The interaction between isofezolac and probenecid has been studied with the aid of a specific HPLC assay for isofezolac in plasma and urine. 8 healthy adult volunteers received a single 40 mg oral dose of isofezolac before and after 3 days of loading with 0.5 g probenecid t.i.d. There was an increase in the maximum plasma isofezolac concentration from 2.44 to 3.38 µg · ml−1 when probenecid was given. The AUC of isofezolac in plasma increased from 6.73 to 11.28 µg · h · ml−1. After the last dose in a 7 day treatment with 40 mg isofezolac t.i.d., there was an increase in the maximum plasma isofezolac level from 2.84 to 4.96 µg · ml−1 when probenecid was given. The rate of absorption of isofezolac was not affected. An increase in the AUC of isofezolac in plasma was observed from 11.74 to 26.34 µg · h · ml−1. The major effect of probenecid on isofezolac metabolism was a 50% reduction in total isofezolac (free+conjugates) excreted inurine. Because of this interaction, patients given isofezolac combined with probenecid will have a higher steady-state plasma level of isofezolac than when probenecid is not administered.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 28 (1985), S. 41-43 
    ISSN: 1432-1041
    Keywords: disopyramide ; atenolol ; pharmacokinetics ; drug interaction ; ischaemic heart disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effect of atenolol on the total elimination of disopyramide and its main dealkylated metabolite was studied in 6 patients and 3 volunteers. During administration of 50 mg atenolol b.i.d. the clearance of disopyramide decreased significantly (p〈0.02) from 1.90±0.71 (X±SD) to 1.59±0.68 ml/kg/min, while its half-life, concentration of the metabolite, and the volume of distribution remained unchanged. The reduction in the clearance of disopyramide by atenolol might contribute to the alleged pharmacodynamic interaction between disopyramide and β-blocking drugs.
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  • 10
    ISSN: 1432-1041
    Keywords: allopurinol ; benzbromarone ; oxipurinol ; pharmacokinetics ; repeated dose ; drug interaction ; urate excretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Previous studies have described a pharmacokinetic interaction between probenecid, a uricosuric drug, and oxipurinol, the major metabolite of allopurinol. In single dose studies, no interaction was found to occur between benzbromarone, another uricosuric agent, and oxipurinol. A cross over study was conducted in 12 volunteers to compare the kinetics of allopurinol and oxipurinol following treatment for 7 days with allopurinol alone or combined with benzbromarone 20 or 100 mg. The pharmacokinetic parameters of allopurinol were not modified by the uricosuric therapy, but those of oxipurinol were markedly altered by concurrent administration even of the lower dose of benzbromarone; the average plasma level fell by 30% and the renal elimination rate was increased by 50%. A parallel increase in the renal elimination rate of uric acid was observed (significant only with the higher dose of benzbromarone) and a positive linear correlation between the fractional excretion of uric acid and that of oxipurinol was established.
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