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Arzneimittelforschung 2012; 62(07): 313-318
DOI: 10.1055/s-0032-1309043
Original Article
© Georg Thieme Verlag KG Stuttgart · New York

Pharmacokinetics and Cardiovascular Effect of Etoricoxib in the Absence or Presence of St. John’s Wort in Rats

M. A. Radwan
1   Department of Pharmacy Practice, College of Pharmacy, Princess Noura Bint Abdelrahman, Riyadh, Saudi Arabia
,
N.A. A. Baky
2   Department of Pharmacology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
,
I. Zaghloul
2   Department of Pharmacology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
,
H. Y. Aboul-Enein
3   Pharmaceutical and Medicinal Chemistry Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki, Cairo, Egypt
› Author Affiliations
Further Information

Publication History

received 15 January 2012

accepted 20 March 2012

Publication Date:
27 April 2012 (online)

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Abstract

Objectives:

The effect of chronic administration of etoricoxib (EXB), in the absence or presence of St. John’s Wort (SJW), on its pharmacokinetic parameters and blood pressure was investigated in rats.

Methods:

Rats were divided into 3 groups, each group received daily different oral treatment for 3 weeks. Rats’ blood pressures were monitored initially, after 1 and 3 weeks of treatment, and after 1 week of discontinuing dosing of both drugs. EXB pharmacokinetic parameters in the absence or presence of SJW were calculated after 3 weeks.

Key findings:

SJW was significantly affected EXB pharmacokinetic parameters. The steady state peak plasma concentration and terminal half-life were reduced by 32% and 91%, respectively, due to a > 3 fold increase in its apparent clearance which is a concentration and time dependent effect. EXB was significantly increased (P<0.001) Rats’ blood pressure while, co-administration of EXB and SJW was not significantly affect (P>0.05) rats’ blood pressure as compared to the control.

Conclusions:

Monitoring blood pressure of patients anticipated taking EXB for extended period should be advised. The co-administration of SJW with EXB should be avoided since SJW would greatly reduce EXB concentrations by inducing its metabolism.

Key words

etoricoxib - St. John’s Wort - pharmacokinetics - blood pressure - rats
 

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