Excipients Amount added (mg) Azithromycina
% Recovery ± SD
Cephalexin monohydrateb
% Recovery ± SD
Lactose 20 99.3 ± 0.7 98.2 ± 0.3
Dextrose 20 98.4 ± 0.9 99.5 ± 0.7
Cellulose 20 98.5 ± 0.8 101.1 ± 0.6
Magnesium stearate 20 101.2 ± 0.4 99.4 ± 0.4
Talc 20 98.4 ± 0.4 100.2 ± 0.4
Starch 20 99.5 ± 0.2 99.4 ± 0.7
Gelatine 20 100.2 ± 0.5 98.8 ± 0.6
a40 (μg m L-1) of azithromycin
b100 (μg m L-1) of cephalexin monohydrate
Table 5: Determination of drugs in presence of excipients.