My pcp told me it is actually an anitdepressant, but it does not work too well for that purpose, but they discovered it helps people sleep. I just pciked up the pills and they are 50 mg so I am going to take 1/2 tonight and if I am still awake an hour later, I will try another half. I guess if I need it I can go up to 150, but hopefully that will not be the case.