Pharmacokinetics Clinical Trial
Official title:
Evaluation of Amlodipine Pharmacokinetics in Patients Receiving Hi Flux Hemodialysis
The current study will evaluate the plasma pharmacokinetics of amlodipine in a cohort of 8 adult volunteers who are receiving regular hemodialysis treatment (HD) 3 days a week for 4 hours each day and have been taking a total daily dose of 5-10 mg of amlodipine besylate for >30 days as part of their usual care. Blood sampling will occur over 13 hours, with frequent sampling during HD and in the 4 hours after termination of HD treatment. The 8 subjects will all receive their prescribed total daily dose of 5-10 mg 5 hours prior to HD treatment. The pre-HD sample will also be sent for pharmacogenomics genotyping. Safety and pharmacodynamic assessments (blood pressure (BP) and heart rate (HR) assessments) will be performed throughout the study. Axiom Precision Medicine Research Array (Affymetrix, Santa Clara, CA) will be used to evaluate genotype of CYP3A4. CYP3A4 phenotype will be evaluated using the ratio of parent drug to metabolite. Non-compartmental analyses will be performed to compare maximum concentrations (Cmax), time to maximum concentration and area under the curve from time 0 to the last measurable sample (AUClast) between the two phases. Compartmental analyses will be performed to construct a model to explain time-dependent changes in amlodipine clearance. Monte Carlo simulations will be performed to compare amlodipine pharmacokinetic profiles on and off HD.
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