I take 150mg of amitriptyline and have taken it for nearly 13 years. I am 21 and suffer terrible headaches as I had meningococcal encephalitis. It isn't working anymore and I can no longer keep increasing the dosage so need to change medication. I was just wondering how long it would take to come off it before I could take a new medication. The dosage doesn't make me sleepy at all probably because I am so used to it. Thank you for helping!