I’m going to add the dosages as well because it could be your dad isn’t on a high enough dose.
Carbamazepine 300 mg 3x a day
Gabapentin 900 mg 3x
Methadone 10mg 3x a day
And then I have to take sodium pills because of the carbamazepine. I’m really sensitive to it and had to be hospitalized Bc of low sodium.
I was also told Forces of Nature Nerve Oil treatment was really helpful. I just got it from Amazon so I haven’t tried it yet but a friend suffering from trigeminal neuralgia swears by it.
If you have hesitations or questions about methadone. I know I did! The only thing I had heard about it was that it was to help heroin addicts stop taking heroin.
But although it is an opioid it acts differently than other opiates and works really well on nerve pain. I had been given Norco, dilaudid and even fentanyl in the hospital before we knew I had trigeminal neuralgia and none of those touched the pain because it is nerve pain. But methadone acts differently and may help.
I’m sorry your dad is suffering and I really hope he finds something to help. He’s lucky to have a son so invested in his care.