... tubular secretion of creatinine It is important to determine whether acyclovir inhibits the tubular transport of creatinine, because if this is the case, then in addition to creatinine, other biomarkers ... [2-14C] creatinine in the apical compartment in the absence of quinidine Creatinine transport was significantly (p < 0.05) inhibited in the presence of quinidine at 30 minutes The concentration of ... absence of acyclovir (22 to 89 μM) In contrast, the concentration of [2- 14 C] creatinine was decreased in the apical compartment in the presence of quinidine, compared to the concentration of [2-14C]...