I have nerve pain but the doctor cannot diagnose the cause. He put me on the Nortriptyline and the pain got better. I've been taking the medication for about 6 months. I was OK with 3 pills per day, but recently went to 4 when it seemed like 3 was not working for a few days. I can go up to 5 a day, but am concerned about the effects of taking this medication for a long period (I have no info from my Doctor re: how long I will need to take this). I know some meds like Haldol have side effects that cannot be reversed after taking for a year. Any help or links to info would be greatly appreciated. Thanks, Mark