Epilepsy May be given as monotherapy.
Adult & childn >13 yr Initially 100-200 mg once or twice daily, increase gradually until optimum response is achieved (generally 400 mg 2-3 times daily).
Childn 6-12 yr Initially 100 mg daily in 2 divided doses, increased 100 mg daily in 3-4 doses for each interval 1 mg until optimal effect is achieved. Not to exceed 1,000 mg daily,
<6 yr Initially 20-60 mg in divided doses, may be increased to 60 mg daily every 3-7 days (steady state is usually <3 days) until optimal effect is achieved. Not to exceed 600 mg daily. Maintenance:
Childn 11-15 yr 600-1,000 mg daily,
6-10 yr 400-600 mg daily. Not to exceed 1,000 mg daily.
Trigeminal neuralgia Initially 200-400 mg daily in 2 divided doses to be increased to 200 mg up to 800 mg daily in divided doses to obtain pain relief. Larger dosage should be given in 3-4 divided doses. Max: 1,200 mg daily, reduce dosage gradually to a min effective dose as soon as pain can be overcome.