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VH4524184 + phenytoin is an investigational drug combination consisting of the novel small molecule anticonvulsant VH4524184 and the established anti-epileptic drug phenytoin. VH4524184 is a new chemical entity (NCE) currently being developed by Viatris, which entered Phase 1 clinical development in 2023 for the treatment of epilepsy. Phenytoin is a classic anticonvulsant that acts as a non-selective blocker of voltage-gated sodium channels. This specific combination is primarily utilized in clinical pharmacology studies (such as NCT05848427) to evaluate the potential for drug-drug interactions (DDI). Specifically, researchers are investigating the effect of VH4524184 on the pharmacokinetics of phenytoin, which is a known substrate for the cytochrome P450 enzymes CYP2C9 and CYP2C19. These studies are essential for establishing the safety profile and appropriate dosing regimens for VH4524184 when used in conjunction with standard-of-care seizure medications.
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