If carbamazepine is ineffective or has adverse effects, one of the following oral drugs may be tried: Oxcarbazepine 150 to 300 mg twice a day Baclofen 5 mg 3 times a day, then increasing every 3 days as needed by 5 mg 3 times a day up to a maximum of 80 mg a day (eg, 20 mg 4 times a day) Lamotrigine 25 mg once a day for 2 weeks, then increasing to 50 mg once a day for the next 2 weeks, then increasing by 50-mg increments every 2 weeks as needed up to a maximum of 400 mg a day (200 mg twice a day) Gabapentin 300 mg once a day on day 1, 300 mg twice a day on day 2, 300 mg 3 times a day on day 3, then increasing dose as needed to 1200 mg 3 times a day Phenytoin 100 to 200 mg twice a day (beginning with 100 mg twice a day, then increasing as needed) Amitriptyline 25 to 150 mg taken at bedtime (beginning with 25 mg, then increasing by 25-mg increments each week as needed) Peripheral nerve block provides temporary relief.