Visual function is stable in patients who continue long-term vigabatrin therapy: implications for clinical decision...

Area of Science:

• Neurology
• Ophthalmology

Background:

• Vigabatrin (VGB) is associated with visual dysfunction, including visual field constriction.
• Prolonged VGB treatment necessitates understanding its long-term safety profile.

Purpose of the Study:

• To assess the safety of continuing long-term vigabatrin therapy in epilepsy patients.
• To monitor visual function changes over one year of continued VGB treatment.
• To evaluate the efficacy of alternative antiepileptic drugs (AEDs) in patients discontinuing VGB.

Main Methods:

• Serial visual function testing (visual acuity, color vision, perimetry) every 3 months for one year in patients continuing VGB.
• Monitoring seizure response in patients discontinuing VGB and starting alternative AEDs for at least 3 months.

Main Results:

• No significant worsening of visual acuity, color vision, or visual field constriction was observed in patients continuing VGB therapy.
• Many patients who stopped VGB achieved good seizure control with alternative AEDs, including previously ineffective ones.

Conclusions:

• Continued vigabatrin therapy may be safe for patients with excellent seizure response and only mild visual changes, provided close visual monitoring.
• Alternative antiepileptic drugs are effective for patients experiencing significant seizures or considerable visual dysfunction with VGB.