insomnia
"I'm 19 and have been taking this medicine for insomnia since I was 8 or 9 years old (It's been so long that I can't recall exactly when I started). It is the only thing that can put me to sleep as my insomnia is so bad that if I don't take amitriptyline, I will be up for days. The only issue is that it does make me very groggy in the morning, but that could just be due to the fact that I am a teenager."