Abstract
During the course of routine plasma drug level monitoring, an unexpected loss of seizure control and reduction in plasma phenytoin levels was noticed in two patients who were also taking ‘Shankhapushi’ (SRC), an Ayurvedic preparation. Therefore, the present study was undertaken in rats to investigate any SRC-phenytoin interaction from both pharmacokinetic (serum levels) and phar- macodynamic (electroshock seizure prevention) aspects. Single dose SRC and phenytoin (oral/i.p.) coadministration did not have any effect on plasma phenytoin levels but decreased the antiepileptic activity of phenytoin significantly. On multiple-dose co- administration, SRC reduced not only the antiepileptic activity of phenytoin but also lowered plasma phenytoin levels. SRC itself showed significant antiepileptic activity compared to placebo and is worth further investigation. However, the clinical combination of SRC with phenytoin is not advised.
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