Excipients ERY ROX CLR Lactose monohydrate 98.08 102.09 100.25 Microcrystalline cellulose 99.27 101.98 98.54 Magnesium stearate 99.52 101.96 98.71 Starch 99.30 102.09 98.09 Talc 99.54 99.78 101.24

Table 4: Recovery of macrolides in presence of common excipients.