Simultaneous Determination of Telmisartan and Pitavastatin Calcium in Intestinal Perfusate by HPLC: Application to Intestinal Absorption Interaction Study

Author(s): Junying Wang, Juan Liu, Xiangrong Song, Chunmei Fu*

Journal Name: Pharmaceutical Nanotechnology

Volume 8 , Issue 4 , 2020


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Graphical Abstract:


Abstract:

Background: Hypertension and hypercholesterolemia are two main physiological risk factors of cardiovascular disease, and commonly occur in combination. Multicompound combination therapy is rational for the treatment of concurrent hypertension and hypercholesterolemia, while telmisartan and pitavastatin calcium can be used as a potential drug combination.

Objective: The aim of this paper is to study the intestinal absorption and absorption interaction of telmisartan and pitavastatin calcium.

Methods: An HPLC method was developed and validated to determine telmisartan and pitavastatin calcium in intestinal perfusate simultaneously. The in situ single-pass perfusion in rats was utilized to investigate the effects of concentrations, intestinal segment (duodenum, jejunum, ileum and colon) and co-administrated drugs on absorption.

Results: The effective permeability coefficient and the absorption rate constant of telmisartan were higher in the duodenum as compared to other intestinal segments. However, the intestinal absorption of pitavastatin calcium was not segmental dependent. The effective permeability coefficient and absorption rate constant have no significant difference among three concentrations of telmisartan, pitavastatin calcium individually and their combination.

Conclusion: The results showed that telmisartan and pitavastatin calcium were transported passively, and telmisartan and pitavastatin calcium could be absorbed well in all intestinal segments. The intestinal absorption parameters revealed the absence of any intestinal absorption interaction when co-administered.

Lay Summary: Co-administration of telmisartan and pitavastatin calcium can provide a potential therapeutic strategy for the treatment of concurrent hypertension and hypercholesterolemia. We are investigating the intestinal interaction of these two drugs in rats using the developed HPLC method and in situ single-pass perfusion technology. We will calculate some parameters after administrating two types of drugs either separately or together, which help reflect changes regarding intestinal absorption and penetration. Compared with telmisartan and pitavastatin calcium administrated separately, if parameters significantly change after co-administration, it proves the existence of the intestinal interactions. Moreover, the results might contribute to clinic drug monitoring.

Keywords: Cardiovascular disease, HPLC, in situ single-pass perfusion, intestinal absorption interaction, pitavastatin, telmisartan.

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Article Details

VOLUME: 8
ISSUE: 4
Year: 2020
Published on: 08 October, 2020
Page: [313 - 322]
Pages: 10
DOI: 10.2174/2211738508666200607181727
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