Condition Sampling Interval (days) Drug Content (%) Physical appearance t90% (years)
    25 ÂșC / 60 % RH 30 99.71(1.09) +     2.56
60 99.25(1.15) +
90 98.98(2.57) +
120 98.59(3.01) +
150 98.27(1.70) +
180 98.06(1.98) +
Table 4: Stability study of optimized microsphere (F4) at laboratory ambient conditions.