Abstract
Objective: The objective of the present study is to establish a simple, sensitive, and specific RP-HPLC technique to determine atorvastatin calcium (ATV) and atenolol (ATL) in rabbit plasma.
 Methods: Both the drugs like atorvastatin calcium and atenolol have been extracted by simple liquid-liquid extraction with acetonitrile.
 Results: The chromatographic separation has performed on a reversed-phase C18 column with a mobile phase of phosphate buffer (pH 4.0): acetonitrile: methanol (40:40:20, v/v). The techniques have been validated over the concentration range of 22.08-4778.37 ng ml-1 for ATV and 18.35-3969.20 ng ml-1 for ATL in rabbit plasma. The acceptability range was satisfied for all validation criteria. These methods have been profitably applied to the pharmacokinetic study of a bilayer tablet of ATV and ATL after an oral administration to a rabbit. A significant recovery of the drug from plasma resulted from acetonitrile as extracting solvent compared to other organic solvents.
 Conclusion: The results obtained proved that the RP-HPLC method developed was accurate and reproducible, and the drug was stable in rabbit plasma.
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