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A sensitive spectrofluorimetric procedure for the determination of paroxetine-HCl in pharmaceutical formulations and human plasma has been described. The native fluorescence of the drug has been studied under different conditions. Maximum fluorescence intensity was obtained in methanol at 340 nm using 290 nm for excitation. Different surfactants showed negative effect on the fluorescence intensity of paroxetine-HCl. Regression analysis of Beer's plot showed good correlation (r=0.9999) between fluorescence intensity and concentration over the range of 0.05-0.40 microg ml-1 with lower limit of detection (LOD) of 0.015 microg ml-1. The drug was successfully determined in its tablets with average % recovery of 98.00+/-0.99% which was in accordance with those given by a compendial method. The method was also applied to the determination of paroxetine-HCl in spiked human plasma with average recovery of 77.70+/-1.06%.

Spectrofluorimetric Determination of Paroxetine Hydrochloride in Its Formulations and Human Plasma