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A new high performance liquid chromatography method was developed and validated for the quantitation of tramadol, paracetamol, and domperidone in pharmaceutical formulations. Determination was performed using a Inertsil-ODS-3 (C-18) column (5 μm, 250 mm × 4.60 mm), a mobile phase containing methanol–phosphate buffer (pH 4.0; 40 + 60, v/v), in gradient flow rate 1.2 mL. The method was validated with respect to linearity, precision, robustness, and accuracy. The calibration graphs ranged from 250 to 1500 mg/mL for paracetamol, 25 to 150 mg/mL for tramadol, and 5 to 30 mg/mL for domperidone. Intra- and interday relative standard deviation values for the standard solutions were 0.077%, 0.98%, and 1.04%, respectively. Repeatability of relative standard deviation values was 0.115%, 0.494%, and 1.97% respectively. Total recoveries of paracetamol, tramadol, and domperidone from the laboratory prepared mixtures were 100.4, 100.06, and 100.2%, respectively.

A novel stability indicating high performance liquid chromatographic assay method was developed and validated for Olmesartan medoxomil and its degradant product. An isocratic HPLC method was developed to separate the drug from the degradation products, using an Inertsil-ODS-3 (C-18) Column (5 µm, 250 mm × 4.60 mm). A mixture of phosphate buffer (pH 4.0) and methanol (30:70) was used as mobile phase. The flow rate was 1.0 mL/min and the detection was carried out at 230 nm. The validation studies were carried out fulfilling the International Conference on Harmonisation (ICH) requirements. The procedure was found to be specific, linear, precise (including intra and inter day precision), accurate, and robust.