Six normal rats were injected intravenously with 99mTc(V )-DMSA. The blood radioactivity vs. time curve showed that pharmacokinetics of 99mTc(V )-DMSA accorded with the two compartment open model. The important kinetic parameters were as follows:T1/2(α )= 3.4min
T1/2(β) = 70.9min
V(c) = 272ml
K21 = 0.058min-1
K10= 0.034min-1 and K12= 0.122min-1. These results indicated the drug was distributed very rapidly and widely from blood to tissues
and its e1Anination was also rapid
eg. an almost complete elimination from blood need only 6-7h. The drug’s existing form in rat blood was studied as well.