The Central Composite Design method was utilized to validate a precise RP-HPLC method for concurrently determining the quantities of Paracetamol (PC), Diclofenac Sodium (DS), and Eperisone Hydrochloride (EH) in tablet compositionsBy employing Design of Experiment (DOE), the exptl. parameters were fine-tuned, resulting in an optimized eluent consisting of methanol: water (90:10) with 0.1% orthophosphoic acid at a eluent velocity of 1 mL/min.The method exhibited exceptional purities: PC (100.83% ± 0.85), DS (102.01% ± 0.90), and EH (100.49% ± 1.29).Regression equations were formulated for PC, DS, and EH as follows: y = 479762x + 151907, y = 2182788x + 2409442, and y = 777144x - 1146334, resp.The anal. method underwent comprehensive validation, including tests for: Accuracy, Precision, Linearity and Robustness.To assess the method's environmental impact, several Green Anal. Chem. (GAC) tools were employed.These tools provided a multifaceted evaluation of the method's sustainability and eco-friendliness.