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Pharmacokinetic and Pharmacodynamic Interaction of Boswellic Acids and Andrographolide with Glyburide in Diabetic
Sujatha Samala1, Ciddi Veeresham1
1Department of Pharmacognosy, University College of Pharmaceutical Sciences, Kakatiya University, Warangal, Telangana, India.
Abstract:
The effect of boswellic acids (BA) and andrographolide (AD) on the pharmacokinetics and pharmacodynamics of glyburide in normal as well as in streptozotocin-induced diabetic rats was studied. In normal and diabetic rats, the combination of glyburide with BA or AD increased significantly (p < 0.01) all the pharmacokinetic parameters, such as Cmax, AUC0-n, AUCtotal, t1/2, and mean residence time, and decreased the clearance, Vd, markedly as compared with the control group. In rat liver, microsomes BA and AD have shown CYP3A4 inhibitory activity significantly (p < 0.01), compared with the vehicle group. The increase in hypoglycemic action by concomitant administration of glyburide with BA or AD was more in diabetic rats than when the drugs were used singly and with the control group, which suggests the enhancement of glucose reduction capacity of glyburide in diabetic rats along with BA or AD. In PK/PD modeling of BA and AD with glyburide, the predicted PK and PD parameters are in line with the observed PK and PD parameters. The results revealed that BA and AD led to the PK/PD changes because of glyburide-increased bioavailability and because of the inhibition of CYP3A4 enzyme. In conclusion, add-on preparations containing BA or AD may increase the bioavailability of glyburide, and hence the dose should be monitored.
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