I started on 10 mg a year ago for migraine. All ok! Then after 6 months, I started getting muscle fatigue I could hardly walk across the room. I realised my body needed more, so decided to stop now. It took a while, then a few months later my mum died, and my migraines were dreadful. My doctor recommended 20mg. I really needed a short term answer, so went back on them, them 6 months later same scenario but worse.
I did some research and started taking 5 htp. Within a few days there's a definite improvement. It boosts seratonin in the brain, which amatriptyline does for depression, helps with sleep, suppresses appetite( if you need to) , but most of all my joints are getting back to normal. I take 2 x 200 mg a day . Morning and evening. Hope this helps .