A pharmacokinetic-pharmacodynamic model for duodenal levodopa infusion
2011 (English)In: Clinical neuropharmacology, ISSN 0362-5664, E-ISSN 1537-162X, Vol. 34, no 2, 61-65 p.Article in journal (Refereed) Published
Objective: The purpose of this work was to identify and estimate a population pharmacokinetic-pharmacodynamic model for duodenal infusion of a levodopa/carbidopa gel (Duodopa) to examine pharmacological properties of this treatment.
Methods: The modeling involved pooling data from 3 studies (on advanced Parkinson disease) and fixing some parameters to values found in literature. The first study involved 12 patients studied on 3 occasions each and was previously published. The second study involved 3 patients on 2 occasions. A bolus dose was given after a washout during night. Plasma samples and motor ratings (clinical assessment of motor function on a 7-point treatment response scale ranging from "very off" to "very hyperkinetic") were collected until the clinical effect returned to baseline. The third study involved 5 patients on 3 occasions receiving 5 different dose levels. Different structural models were evaluated using the nonlinear mixed-effects modeling program NONMEM VI. Population mean parameter values, and interindividual, interoccasion, and residual variabilities were estimated.
Results: Absorption of the levodopa/carbidopa gel can be adequately described with first-order absorption with bioavailability and lag time. Estimated population parameter values were a mean absorption time of 28.5 minutes, a lag time of 2.9 minutes, and a bioavailability of 88%. The pharmacodynamic model for motor ratings had the following population values: a half-life of effect delay of 21 minutes, a concentration at 50% effect of 1.55 mg/L, an E-max of 2.39 U on the treatment response scale, and a sigmoidicity of the E-max function of 11.6.
Conclusions: For the typical unmedicated subject, it will take 51.4 minutes until the peak levodopa effect is reached after a bolus dose. This delay is, like the magnitude of the effect, highly variable in this patient group. The residual error magnitudes of 20% for levodopa concentrations and 0.92 U (SD) for motor ratings indicate that the models developed provide predictions of a relevant quality. The developed model may be a first step toward model-guided treatment individualization of duodenal infusion of levodopa.
Place, publisher, year, edition, pages
2011. Vol. 34, no 2, 61-65 p.
Levodopa, infusion, Parkinson’s disease, pharmacokinetic, pharmacodynamic
Medical and Health Sciences
Research subject Medical Informatics; Neurology; Pharmacokinetics and Drug Therapy
IdentifiersURN: urn:nbn:se:uu:diva-132634DOI: 10.1097/WNF.0b013e31820b570aISI: 000288445400002PubMedID: 21297456OAI: oai:DiVA.org:uu-132634DiVA: diva2:358656