In the present study an isocratic reverse phase-high performance liquid chromatography (RP-HPLC) method was developed and validated for simultaneous estimation of dicyclomine hydrochloride (DCY) and famotidine (FAM) in bulk and pharmaceutical dosage forms. The separation was achieved on a Phenomex Gemini C 18 column (4.6 x 250 mm, 5µ particle size) using a mixture of methanol and 0.1% triethylamine (TEA) pH 3.0 (adjusted with orthophosphoric acid) in the ratio of 40:60 (v/v) as a mobile phase. The flow rate was 1.0 mL min -1 , column temperature was kept at 28 0 C and detection was monitored at 270 nm. The retention time of dicyclomine hydrochloride and famotidine was found to be 10.72 and 2.72 min respectively. Recovery studies were satisfactory and the correlation coefficient for FAM and DCY were 0.9947 and 0.9935 respectively, indicates linearity of the methods within the limits. The developed method can be used for routine quality control simultaneous analysis of DCY and FAM in tablet dosage form without any interference of excipients.

A simple, specific, accurate and precise reversed phase high pressure liquid chromatography (RP-HPLC) method has been developed for the simultaneous estimation of tramadol hydrochloride (TRA) and dicyclomine (DCY) in bulk and tablet dosage form. Chromatography was carried on Phenomex Gemini C 18 column (4.6 x 250 mm, 5µ particle size) using mixture of methanol, acetonitrile and 0.1% triethylamine (TEA) pH 3.0 (adjusted with orthophophoric acid) in the ratio of 35:5:60 (v/v/v) respectively as a mobile phase. The flow rate 1.0mL min -1 and detection wavelength 275 nm was selected for the present study. The retention time of tramadol hydrochloride and dicyclomine were 4.13 min and 9.06 min respectively. The linear regression analysis data for the calibration plots showed a good linear relationship over the concentration range of 50-300 μg mL -1 for tramadol hydrochloride and 10-60μg mL -1 for dicyclomine. The proposed method was validated with respect to linearity, precision, accuracy, specificity and robustness. The proposed method was found to be simple, rapid, accurate, precise and reproducible. Thus it can be applied for routine quality control analysis of tramadol hydrochloride and dicyclomine in tablet dosage form.

A simple, precise and accurate isocratic RP-HPLC method was successfully developed for the simultaneous determination of chlorpheniramine maleate (CPM), phenylephrine hydrochloride (PHE) and ibuprofen (IBU) in bulk and pharmaceutical preparation. The separation of the drugs was achieved using Inertsil ODS C18 column with mobile phase consisting of methanol and 0.1% triethylamine (55:45 V/V) in water, pH 3 (adjusted with orthophosphoric acid). These drugs were resolved successfully with retention time of 3.0 min for CPM, 4.6 min for PHE and 18.9 min for IBU, when the eluate was monitored at 240 nm. Linearity was found in the concentration range of 10 to 50 μg mL-1 for CPM, 25 to 125 μg mL-1 for PHE and 100 to 500 μg mL-1 for IBU, with a correlation coefficient (r2) of 0.9987, 0.9965 and 0.9998 for CPM, PHE and IBU, respectively. Thus, the proposed method can be successfully applied to the pharmaceutical preparation containing the above mentioned drugs without any interference of excipients.