Oral / IV
- Mechanism of Action
- Inhibits voltage-gated sodium channels, preventing propagation of action potentials and thus suppressing seizure activity.
- Non-linear pharmacokinetics – small dose changes can result in large changes in plasma concentration.
- Co-administration with valproate results in increased serum concentrations of phenytoin
- Generalised tonic-clonic seizures
- Status epilepticus (IV)
- Adverse Effects
- Nausea / vomiting
- CNS disturbances – drowsiness, tremor, dysarthria, diplopia
- Purple glove syndrome (IV) – distal limb discolouration, pain and swelling
- Anticonvulsant hypersensitivity syndrome (prolonged admin) – fever, rash, lymphadenopathy, hepatitis, myositis
- Plasma concentration should be monitored in order to ensure therapeutic effect.
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