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Felodipine clinical pharmacokinetics
1Department of Cardiology, Ignatius Hospital, Breda, The Netherlands.
Clinical Pharmacokinetics
|December 1, 1991
Summary
Felodipine exhibits rapid absorption and consistent bioavailability, but wide plasma concentration variability necessitates individualized dosing. Special populations and drug interactions require careful dosage adjustments for optimal hypertension management.
Area of Science:
- Pharmacology
- Cardiovascular Medicine
Background:
- Felodipine is a calcium channel blocker used for hypertension.
- Understanding its pharmacokinetic profile is crucial for effective therapeutic use.
Purpose of the Study:
- To characterize the absorption, bioavailability, and pharmacokinetic variability of felodipine.
- To investigate factors influencing felodipine plasma concentrations and its clinical implications.
Main Methods:
- Review of pharmacokinetic data from various oral formulations.
- Analysis of factors affecting absorption, metabolism, and elimination.
- Assessment of drug interactions and effects in specific patient populations.
Main Results:
- Felodipine shows rapid absorption and 15% bioavailability due to extensive first-pass metabolism.
- Plasma concentrations correlate linearly with dose but exhibit significant inter-individual variability.
- Elderly patients, those with heart failure or liver cirrhosis, and those taking certain interacting drugs may require dosage adjustments.
- Extended-release formulations mitigate interactions with digoxin.
Conclusions:
- Individualized dosing of felodipine is recommended due to wide pharmacokinetic variability.
- Dosage adjustments are necessary in specific patient groups and in the presence of interacting medications.
- The pharmacokinetic profile supports once-daily dosing for hypertension management, particularly with extended-release formulations.