Abstract | BACKGROUND AND OBJECTIVE: Oral levodopa- carbidopa (LC-oral) treatment in advanced Parkinson's disease (PD) is associated with motor complications due to large fluctuations in levodopa plasma concentrations. Levodopa- carbidopa intestinal gel (LCIG) provides individualized continuous levodopa- carbidopa delivery through intrajejunal infusion. This study evaluated the pharmacokinetics, safety, and efficacy of LCIG relative to LC-oral in Japanese subjects with advanced PD. METHODS: Subjects with advanced PD were converted from their anti-PD medications to individually optimized doses of LC-oral (10:1 levodopa: carbidopa ratio) for 28 days (baseline; period 1) followed by switching to intrajejunal infusion of LCIG (4:1 ratio) for 21 days (period 2). Pharmacokinetics, adverse events (AEs), and efficacy were assessed. RESULTS: Eight patients were enrolled. Six received LCIG and four reported at least one AE [most common: fall (33.3 %), dyskinesia (33.3 %)]; one discontinued due to an AE. The average daily dose was 1230/123 and 1370/342 mg levodopa/ carbidopa for LC-oral and LCIG, respectively, at the end of each period. The degree of fluctuation and intra-subject variability of levodopa plasma concentrations were 5.5- and 4-fold lower, respectively, with LCIG than with LC-oral. Levodopa bioavailability was 99 % for LCIG relative to LC-oral. Compared with baseline, LCIG decreased "Off" time (2.68 h, P = 0.002) and increased "On" time without troublesome dyskinesia (2.35 h, P = 0.006) in the PD Diary(©). With the small sample size, no statistically significant changes were seen on other efficacy endpoints. CONCLUSIONS: In Japanese subjects with advanced PD, LCIG resulted in an improved pharmacokinetic profile that appeared to be associated with reduced motor complications compared with LC-oral. These results extend previous findings in mainly Caucasian populations.
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Authors | Ahmed A Othman, Krai Chatamra, Mohamed-Eslam F Mohamed, Sandeep Dutta, Janet Benesh, Masayoshi Yanagawa, Masahiro Nagai |
Journal | Clinical pharmacokinetics
(Clin Pharmacokinet)
Vol. 54
Issue 9
Pg. 975-84
(Sep 2015)
ISSN: 1179-1926 [Electronic] Switzerland |
PMID | 25875940
(Publication Type: Journal Article, Multicenter Study, Randomized Controlled Trial, Research Support, Non-U.S. Gov't)
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Chemical References |
- Antiparkinson Agents
- Drug Combinations
- Gels
- Tablets
- Levodopa
- Carbidopa
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Topics |
- Administration, Oral
- Aged
- Antiparkinson Agents
(administration & dosage, adverse effects, pharmacokinetics)
- Carbidopa
(administration & dosage, adverse effects, pharmacokinetics)
- Drug Combinations
- Female
- Gels
- Humans
- Infusions, Parenteral
- Levodopa
(administration & dosage, adverse effects, pharmacokinetics)
- Male
- Middle Aged
- Parkinson Disease
(drug therapy, metabolism)
- Pilot Projects
- Precision Medicine
- Tablets
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