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Acta Pharmacol Sin. 2016 Jul;37(7):994-1001. doi: 10.1038/aps.2016.24. Epub 2016 May 16.

Population pharmacokinetic modeling and simulation of huperzine A in elderly Chinese subjects.

Author information

1
Department of Clinical Pharmacology, Zhongshan Hospital, Fudan University, Shanghai 200032, China.
2
Department of Geriatrics, Central Hospital of Shanghai Xuhui, Shanghai 200031, China.
3
Zhejiang Hospital, Hangzhou 310013, China.
4
Central Laboratory, Central Hospital of Shanghai Xuhui, Shanghai 200031, China.

Abstract

AIM:

Our preliminary results show that huperzine A, an acetylcholinesterase inhibitor used to treat Alzheimer's disease (AD) patients in China, exhibits different pharmacokinetic features in elderly and young healthy subjects. However, its pharmacokinetic data in elderly subjects remains unavailable to date. Thus, we developed a population pharmacokinetic (PPK) model of huperzine A in elderly Chinese people, and identified the covariate affecting its pharmacokinetics for optimal individual administration.

METHODS:

A total of 341 serum huperzine A concentration records was obtained from 2 completed clinical trials (14 elderly healthy subjects in a phase I pharmacokinetic study; 35 elderly AD patients in a phase II study). Population pharmacokinetic analysis was performed using the non-linear mixed-effect modeling software Phoenix NLME1.1.1. The effects of age, gender, body weight, height, creatinine, endogenous creatinine clearance rate as well as drugs administered concomitantly were analyzed. Bootstrap and visual predictive checks were used simultaneously to validate the final population pharmacokinetics models.

RESULTS:

The plasma concentration-time profile of huperzine A was best described by a one-compartment model with first-order absorption and elimination. Age was identified as the covariate having significant influence on huperzine A clearance. The final PPK model of huperzine A was: CL (L/h)=2.4649(*)(age/86)((-3.3856)), Ka=0.6750 h(-1), V (L)=104.216. The final PPK model was demonstrated to be suitable and effective by the bootstrap and visual predictive checks.

CONCLUSION:

A PPK model of huperzine A in elderly Chinese subjects is established, which can be used to predict PPK parameters of huperzine A in the treatment of elderly AD patients.

PMID:
27180987
PMCID:
PMC4933756
DOI:
10.1038/aps.2016.24
[Indexed for MEDLINE]
Free PMC Article

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