PHENYTOIN AND PRAZIQUANTEL

Phenytoin markedly reduces the serum levels of praziquantel, but whether this results in neurocysticercosis treatment failures is unclear. Fosphenytoin, a prodrug of phenytoin, may interact similarly.
When treating systemic worm infections such as neurocysticercosis some authors advise increasing the praziquantel dosage from 25 to 50 mg/kg if phenytoin is being used, but in one case this dose was not effective. Note that the manufac- turers current recommended dose for praziquantel for neurocysticercosis is 50 mg/kg daily in 3 divided doses. The interaction with anticonvulsants is of no importance when praziquantel is used for intestinal worm infections (where its action is a local effect on the worms in the gut).
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