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Department of Infectious Diseases, Hua Shan Hospital, Shanghai Medical University, People's Republic of China.
A randomized double-blind study comparing the therapeutic efficacy of single dose of levo-praziquantel and mixed isomer praziquantel was carried out on 139 matched pairs of patients with schistosomiasis japonica. A single dose of either levo-praziquantel (20 mg/kg) or praziquantel (40 mg/kg) was given to each patient. Four and six months after treatment, the stool ova negative conversion rates were 94.85% and 96.27% for the levo-praziquantel group, and 97.06% and 94.03% for the praziquantel group, respectively; there was no statistically significant difference between the two treatments (P greater than 0.05). For lightly and moderately infected patients, a single 20 mg/kg dose of levo-praziquantel was as efficacious as 40 mg/kg of praziquantel. Moreover, levo-praziquantel produced fewer side effects than praziquantel. These results suggest that levo-praziquantel is the component of the mixed isomer preparation that is antihelminthic. Levo-praziquantel could be used therapeutically at half the current dose of the mixed isomer drug.
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