Hi Tiny,
firstly why is your PALS on it, as in what effects are you hoping to achieve?
my PALS also had FTD, which was not formally diagnosed as he was such rapid progression there was nothing to be gained for putting him through the process of the testing and the resultant paranoia he already had towards me.
However, he did finally agree to amitriptyline, but only because his specialist said it may help him sleep better. He started on 5mg (doc assured him it was only a baby dose ... he was SO paranoid about taking any medication), and said if good after a week take it to 10mg but at least stay on the 5mg for 3 weeks straight before deciding if there were true side effects. This is because in the first week or 2 there can be some temporary side effects that go away.
I put him up to the 10mg after a week, and he stayed on this for his last 5 months.
For him we had the following good effects: he DID start to sleep. After 18 months of broken sleep he started to sleep through the night for a good 6 hours or so. Or he would at least be ok dozing for the last couple of hours, not becoming restless and having to get up, or as he progressed be gotten up.
It took the 'edge' off his FTD. He never had another full rage after starting this. It didn't stop the FTD of course, especially on low doses but it did calm him just a little. I admit however that he then also was rapidly progressing, the total loss of speech and arms may have contributed to him not being as able to go into a rage. Maybe getting sleep every night also helped him in this regard.
Hope that helps a bit