ABSTRACT
Metformin is widely used for type II diabetes. Sugar replacement sweeteners such as Aspartame and Stevia, are usually consumed concomitantly with other antidiabetics by patients The aim of this work is to investigate possible effects of two types of sweeteners; stevia and aspartame on the pharmacokinetic parameters of metformin in rats. A simple, validated bio-analytical HPLC method was developed to measure metformin in rat plasma. Three groups of rats, each of eight were subjected to this study. The first group was given metformin solution 20mg/kg alone, the second group was given 20 mg/kg metformin with 4mg/kg stevia and the third group was given 20 mg/kg metformin with 10 mg/kg aspartame on fasting state. Blood samples were taken on scheduled time interval up to 6 hours and analyzed for metformin concentration. Pharmacokinetic parameters were calculated by Non-Compartmental Model and data were interpreted. The results showed that administration of these two sweeteners did not have high effect on pharmacokinetics of metformin.
ABSTRACT
An easily, specific, precise, and accurate reversed-phase HPLC method was developed and validated for simultaneous estimation of esomeprazole ( Nexium®) and tadalafil (Cialis®) in pharmaceutical formulation. The separation was achieved by using Hypersil BDS C18 column (250 mm × 4.6 mm; 5.0 μm) and acetonitrile: 0.05 M potassium dihydrogen phosphate buffer at pH 6 adjusted with phosphoric acid as a mobile phase at a flow rate of 1 mL/min. Detection was carried out at wavelength 285nm. The retention time of esomeprazole and tadalafil were 3.1, 3.7 min, respectively. The linearity was established over the concentration ranges of 60-180μg/mL and 40-120μg/mL with correlation coefficients 0.9998 and 0.9996 for esomeprazole and tadalafil, respectively. The mean recoveries were found to be in the ranges of 98–102% for esomeprazole and tadalafil. The proposed method has been validated as per ICH guidelines and successfully applied to the simultaneous estimation of esomeprazole and tadalafil in pharmaceutical formulation.