The drug of choice for trigeminal neuralgia is carbamezepine. The starting dose 100-200 mg in divided dosage, and gradually to be increased to 400-800 mg\day depending of response and adverse effects.
The best alternative to carbamazepine is Oxcarbazepine usually started at a dose of 150 to 300 mg , the dose is gradually increased to 900-180
The other alternative is Gabapentin -900- 2400 mg/day, Phenytoin – 300-500mg/day
Baclofen ( 5 mg orally 3 times a day for 3 days, then 10 mg orally 3 times a day for 3 days, then 15 mg orally 3 times a day for 3 days, then 20 mg orally 3 times a day. Maintenance dose: 40-80 mg/day. 80 mg/day doses should be administered in 4 divided doses.)
N.B.: Drugs to be taken under strict medical supervision and the required blood investigations to be done as per recommendation of individual medications