Oxcarbazepina Viatris (Oxcarbazepine)

Oxcarbazepine is employed in the management of seizure disorders, targeting neuronal hyper‑excitability.

• Partial seizures: Reduces the frequency and severity of focal onset seizures.
• Generalized tonic‑clonic seizures: Helps control convulsive episodes in epilepsy.
• Lennox‑Gastaut syndrome: Provides adjunctive seizure control in this severe childhood epilepsy.
• Bipolar disorder (off‑label): May stabilize mood in some patients, though not a primary indication.
• Migraine prophylaxis (off‑label): Occasionally used to prevent migraine attacks.
• Post‑traumatic epilepsy: May be considered to reduce seizure risk after brain injury.

• Oxcarbazepine is a pro‑drug that is rapidly converted to its active metabolite, licarbine (10‑hydroxy‑carbazepine). The metabolite blocks voltage‑gated sodium channels, stabilising neuronal membranes and limiting repetitive firing. This reduction in neuronal excitability underlies its antiepileptic effect and contributes to mood‑stabilising properties in off‑label uses.

Oxcarbazepine may cause a range of adverse reactions, most of which are mild to moderate and resolve with continued therapy or dose adjustment.

Common Side Effects

• Dizziness
• Drowsiness
• Headache
• Nausea
• Hyponatraemia (low blood sodium)
• Rash

Serious or Rare Side Effects

• Stevens‑Johnson syndrome or toxic epidermal necrolysis
• Severe hyponatraemia with seizures or coma
• Aplastic anemia
• Liver function abnormalities
• Blood dyscrasias such as agranulocytosis
• Life‑threatening skin reactions (e.g., drug reaction with eosinophilia and systemic symptoms).

When prescribing Oxcarbazepine, clinicians should consider several safety aspects.

• Renal function: Adjust dose in patients with impaired clearance.
• Hepatic function: Monitor liver enzymes in patients with liver disease.
• Hyponatraemia risk: Check serum sodium regularly, especially in the elderly.
• Pregnancy: Use only if the benefit outweighs potential fetal risk.
• Concomitant drugs: Review for interactions that may affect sodium balance or cardiac rhythm.
• Store at ambient temperature: keep in original container, protect from moisture and direct sunlight.

Oxcarbazepine interacts with several medicines, requiring careful management.

Major Interactions (Avoid)

• Carbamazepine: May increase risk of serious skin reactions.
• Sodium valproate: Can exacerbate hyponatraemia.
• Anticoagulants (e.g., warfarin): May reduce anticoagulant effect.

Moderate Interactions (Monitor Closely)

• Oral contraceptives: May reduce hormonal efficacy.
• SSRIs and SNRIs: Potential for additive hyponatraemia.
• CYP3A4 inducers (e.g., rifampicin): May lower oxcarbazepine levels.
• ACE inhibitors: Heightened risk of low sodium.
• Diuretics: May compound hyponatraemia.