Background: The availability of a low-cost bioanalytical method, easy to transfer and to set
up, represents an advantage in therapeutic drug monitoring and industrial research.
Objective: A simple, sensitive and rapid high performance liquid chromatographic (HPLC) method is
developed and validated for quantitative determination of milnacipran hydrochloride in rabbit plasma.
Method: Simple and effective solid phase extraction technique was performed for sample treatment and it
has resulted in consistent and high recoveries (93–95%) at all concentrations studied. Efficient chromatographic
separation has been performed on a LiChrospher® C18 column using a mobile phase consisting
of a mixture of phosphate buffer, acetonitrile and methanol (65:25:10; v/v/v) at a flow rate of 0.8 mL/min.
Results: The method has demonstrated linearity from 25 ng to 2000 ng/mL with a regression coefficient
of 0.9998. The accuracy was found to be very high (99.31 to 101.44 %). %RSD values for inter-day and
intra-day variation were not more than 3.58. The method has demonstrated high sensitivity with a lower
limit of quantification of 25 ng/mL and excellent stability of milnacipran in rabbit plasma. The method
was applied for pharmacokinetic investigation of immediate release and controlled release milnacipran
tablets. The in-vivo study results indicated that developed HPLC method was sensitive to accurately
quantify the concentration of milnacipran in plasma, which is an essential requirement for determination
of pharmacokinetic parameters for drug formulation studies as well as future bioavailability or bioequivalence
Conclusion: A simple and sensitive bioanalytical HPLC method was developed, validated and applied
for pharmacokinetic studies.