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CYP2D6 and CYP2C19 activity in a large population of Dutch healthy volunteers: indications for oral contraceptive-related gender differences
TLDR
In EM females compared to EM males, CYP2D6 activity is increased and CyP2C19 activity is reduced, and this reduction is substantial and most pronounced in the age range from 18 to 40 years.
Minor effect of multiple dose omeprazole on the pharmacokinetics of digoxin after a single oral dose.
TLDR
It is concluded that co-treatment with omeprazole causes a minor increase in the absorption of oral digoxin, which is not considered to be clinically relevant for the majority of patients.
The prevalence of CYP2D6 and CYP2C19 genotypes in a population of healthy Dutch volunteers
TLDR
The frequencies of CYP1D6 and CYP2C19 allelic variants were in accordance with other European populations, and a gene–dose effect was found for CYP 2C19.
Omeprazole: pharmacology, pharmacokinetics and interactions.
TLDR
The pharmacokinetic profile of omeprazole is rather complicated, showing concentration-dependent elimination kinetics and an oral bioavailability which increases with the dose and during repeated administration, and for the choice of dosage regimens this has minor consequences.
Evaluation of analytical and clinical performance of a dual-probe phenotyping method for CYP2D6 polymorphism and CYP3A4 activity screening.
TLDR
It was concluded that in general a change in dextromethorphan/3-methoxymorphinan (DEX/3MM) ratios of 10% or more as detected with the current method, is a significant increase or decrease in the activity of CYP3A4.
Comparison of the urinary metabolite profile of caffeine in young and elderly males.
TLDR
The urinary metabolite profile of caffeine did not vary substantially with age except for the observation that significantly greater amounts of 1-methyluric acid, 7-methylURic acid and 1-7-dimethyluric Acid were excreted by the elderly subjects.
Effects of alpha-interferon on theophylline pharmacokinetics and metabolism.
TLDR
Additional investigations of the influence of the duration of alpha-interferon treatment are necessary before definite conclusions can be drawn about the mechanism and the clinical relevance of the described interaction.
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