TEST (Claimed content) Interval Mean RSD%
Initial 1Month 2Month 3Month 4Month 5Month 6Month
Studies at Accelerated (40°C+75%H)
DBPN (500 µg/ml) 100.351 99.961 99.476 99.265 98.971 98.432 98.157 99.044 0.794
SBZ (12.5 µg/ml) 99.853  98.983  98.418  98.137  97.975  97.869 97.535 98.153 0.803
MP (5 µg/ml) 99.991 98.615 98.315 98.158 97.518 97.410 97.112 98.160 0.989
PP (2.5 µg/ml) 99.614 99.741 99.534 98.614 98.198 97.536 97.418 98.665 1.002
Stability Studies at Long Term  (30°C+65%H)
DBPN (500 µg/ml) 100.351 100.135 100.384 100.174 99.853 99.239 99.472 99.876 0.443
SBZ (12.5 µg/ml) 100.516 99.623 99.398 98.938 98.917 98.374 98.126 98.896 0.644
MP (5 µg/ml) 101.219 100.526 100.153 99.315 98.815 98.345 98.151 99.503 1.167
PP (2.5 µg/ml) 101.648 101.689 100.235 99.958 99.461 98.432 98.012 99.919 1.432
Table 5: Summary of stability studies.