Two simple, specific, sensitive, accurate and precise stability indicating methods were
described for quantitative determination of the anthelmintics drug Niclosamide. The first method
was high performance liquid chromatographic with the use of a reversed phase hibarR C-18 column
(250 mm · 4.66 mm, 5 lm) and mobile phase of methanol: 1 mM ammonium phosphate buffer
(85:15 v/v) at a flow rate of 1.2 mL/min. The retention time of drug was found to be
6.45 ± 0.02 min. Quantification of drug was achieved with diode array detection (DAD) at
332 nm. Linear calibration curve was obtained in concentration range 0.01–100 lg/mL with r2 value
of 0.999. The limit of detection and limit of quantification were found to be 0.048 lg/mL and
0.01 lg/ml respectively. The second method involved a high performance thin layer liquid chromatographic.
Chromatographic separation was carried out with precoated silica gel G60 F254 aluminum
sheets using toluene:ethyl acetate (7:3% v/v) as a mobile phase. Linearity of proposed
method was found to be 200–700 ng/band at 332 nm with retention factor of 0.59 and r2 value
of 0.998. The limit of detection and limit of quantification were found to be 36.21 ng/band and
109.7 ng/band respectively. Both the developed methods were successfully validated as per International
Conference on Harmonization guideline (ICH). Niclosamide was subjected to different stress
conditions. The degraded product peaks were well resolved from the pure drug peak with significant
difference in their retention time. Stress samples were successfully assayed by developed high