Rheograms of samples presented in Figure
I showed the plastic flow with thixotropic
property due to the flocculation of drug particles
in the suspension [8]. It was found that repeated
viscosity measurement made the decrement of
viscosity. This may be because the structural
network of flocs was destroyed in the previous
measurement while structural reformation was
not yet completed. Although the samples had
high viscosity at rest, they could be poured after
a reasonable amount ofshaking