insomnia
"Take it on an empty stomach, or it won't work. I have terrible insomnia and have been on it long-term. It still works after 15 years. It had some initial side effects, but they went away after a few months. It works very well, but I gave it eight stars only because you have to take on an empty stomach. If I eat a late dinner, I can count on it not working. Otherwise, it's the only medication that has helped me sleep. I take 15-20 mg per night."