title: Therapeutic evaluation of sustained-releasing praziquantel (SRP) for clonorchiasis: phase 1 and 2 clinical studies.
abstract: Sustained-releasing praziquantel (SRP) tablet was designed for single dose treatment regimen of clonorchiasis. A previous pre-clinical study confirmed its sustained-releasing characteristics and a better cure rate than conventional praziquantel (PZQ). In this clinical study, the pharmacokinetics of this SRP tablet were investigated in human volunteers (phase 1; 12 volunteers), and its curative efficacy was examined in clonorchiasis patients (phase 2; 20 volunteers). In the phase 1 clinical study, blood concentrations of both tablets showed wide individual variation. The AUClast of SRP was 497.9 +/- 519.0 ng * hr/ml (mean +/- SD) and PZQ of 628.6 +/- 695.5 ng * hr/ml, and the AUCinf of SRP was 776.0 +/- 538.5 ng * hr/ml and of PZQ 658.6 +/- 709.9 ng * hr/ml. Cmax values of SRP and PZQ were 90.7 +/- 82.2 ng/ml and 214.9 +/- 251.9 ng/ml, and Tmax values were 3.42 +/- 1.43 hr and 1.96 +/- 1.23 hr, respectively. SRP tablets showed similar AUC values, but lower Cmax and longer Tmax values than PZQ. In the phase 2 study, SRP at 30 mg/kg (single dose) achieved a 60% cure rate and a 95.5% egg reduction rate. The cure rate of a single dose SRP was unsatisfactory compared with that of the conventional PZQ dose, but much better than that achieved by a single dose PZQ.
authors.affiliation: Department of Parasitology and Tropical Medicine and Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Min-Ho
authors.initials: MH
authors.lastname: Choi
authors.forename: Byung-Chan
authors.initials: BC
authors.lastname: Chang
authors.forename: Seung-Jin
authors.initials: SJ
authors.lastname: Lee
authors.forename: In-Jin
authors.initials: IJ
authors.lastname: Jang
authors.forename: Sang-Goo
authors.initials: SG
authors.lastname: Shin
authors.forename: Weon-Gyu
authors.initials: WG
authors.lastname: Kho
authors.forename: Jin-Ho
authors.initials: JH
authors.lastname: Chun
authors.forename: Sung-Tae
authors.initials: ST
authors.lastname: Hong
mesh_terms: D000328:Adult; D000818:Animals; D000871:Anthelmintics / Q000009:adverse effects / Q000493:pharmacokinetics / Q000627:therapeutic use; D019540:Area Under Curve; D003003:Clonorchiasis / Q000188:drug therapy*; D003004:Clonorchis sinensis / Q000187:drug effects* / Q000302:isolation & purification; D003692:Delayed-Action Preparations / Q000493:pharmacokinetics / Q000627:therapeutic use; D006801:Humans; D008297:Male; D010270:Parasite Egg Count; D011223:Praziquantel / Q000009:adverse effects / Q000493:pharmacokinetics / Q000627:therapeutic use
chemical_list: D000871:Anthelmintics; D003692:Delayed-Action Preparations; D011223:Praziquantel