I have been taking amitriptyline for two years now for post-concussional symptoms, particularly pain in the head.
I started at a dose of 25 mg, which was obviously too much because I was sleepy all the next day. So, I cut the dose down to 12.5mg which seemed to help with headaches, at least it took the sharpness out of the pain of them. It helped a bit with sleep, which was and still is a problem, but didn't make me so zonked the next day that I couldn't function at all.

I have tried to stop taking it on several occasions but always found that the pain is too much. I am assuming that this is because the drug is having an effect, rather than the pain being caused by withdrawal symptoms. I have been told that the drug isn't very addictive.

I have gradually been going to a lower dose. First I cut down to 10mg and now I am on 7.5 mg nightly.

I haven't been able to cut down any more. I tried only 5mg last night and I have had enough head pain today to make me think that I can't go down to this level.

My doctor told me that the drug does have a long half-life, but I seem to notice the effect of a lower dose within a day or so.

Anyway, everyone is different, but it is good to share experiences just in case it is useful to someone.

CS