Sustained-release praziquantel tablet: pharmacokinetics and the treatment of clonorchiasis in beagle dogs (original) (raw)

Abstract

Praziquantel is rapidly absorbed and secreted; and thus fractional doses are recommended for the treatment of cestode and trematode infections. In the present study, we developed a new praziquantel tablet formula allowing sustained-release (SRP). In vitro dissolution of SRP tablets showed that praziquantel at 300 mg/tablet combined with hydroxypropyl methylcellulose dissolved completely at a constant rate over 10 h, whereas the conventional praziquantel tablet (PZQ) was only 40% dissolved. Pharmacokinetic studies in dogs confirmed that SRP was absorbed more slowly than PZQ. The mean value of the area under the concentration/time curve from 0 h to the final observation time, the maximum concentration in serum, and the time of maximum concentration in serum for SRP were 3,471,500 ng/min for 0.25 ml, 10,300 ng for 0.25 ml, and 192 min, while the values for PZQ were 688,600 ng/min for 0.25 ml, 2,500 ng for 0.25 ml, and 135 min. The cure rate in dogs with a heavy infection (500 metacercariae) treated with a single dose of SRP (150 mg/tablet) at 50 mg/kg was 80%, while in dogs treated with a single dose of SRP (300 mg/tablet) at 30 mg/kg it was 60%, and the cure rate with PZQ was 20%. In each case, the egg reduction rate was similar (over 90%). No abnormal liver functions or hepatic or renal pathologies were observed in dogs administered with SRP at 30 mg/kg. The SRP tablet showed sustained release and slow absorption; and it had an improved anthelmintic efficacy against Clonorchis sinensis in experimental dogs, compared with conventional praziquantel.

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Acknowledgements

The present study was supported by a grant from the Ministry of Health and Welfare, Korea (HMP-98-D-7-0024). We appreciate the assistance of the Shinpoong Pharmaceutical Co. in preparing SRP tablets and monitoring the concentration of praziquantel in dog sera.

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Authors and Affiliations

1. Department of Parasitology and Tropical Medicine, and Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 110-799, Korea
   Sung-Tae Hong, Sang Hyup Lee, Mejeong Lee, Shunyu Li, Byung-Suk Chung & Min-Ho Choi
2. College of Pharmacy, Ewha Womans University, Seoul 120-750, Korea
   Seung-Jin Lee
3. Department of Parasitology, Inje University College of Medicine, Busan 614-735, Korea
   Weon-Gyu Kho
4. Department of Parasitology, Dankuk University College of Medicine, Cheonan 330-714, Korea
   Min Seo

Authors

1. Sung-Tae Hong
2. Sang Hyup Lee
3. Seung-Jin Lee
4. Weon-Gyu Kho
5. Mejeong Lee
6. Shunyu Li
7. Byung-Suk Chung
8. Min Seo
9. Min-Ho Choi

Corresponding author

Correspondence toMin-Ho Choi.

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Hong, ST., Lee, S.H., Lee, SJ. et al. Sustained-release praziquantel tablet: pharmacokinetics and the treatment of clonorchiasis in beagle dogs.Parasitol Res 91, 316–320 (2003). https://doi.org/10.1007/s00436-003-0958-7

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• Received: 23 June 2003
• Accepted: 01 July 2003
• Published: 28 August 2003
• Issue date: October 2003
• DOI: https://doi.org/10.1007/s00436-003-0958-7

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