People with narcolepsy, obstructive sleep apnea (also called hypopnea syndrome), or shift work sleep problems take armodafinil to help them stay awake during the day. This medicine will only help as long as you keep taking it. It will not fix these diseases.

Armodafinil might make it hard for you to think or act. If you drive or do anything else that needs you to be alert, be careful. Don't do anything dangerous until you know how this medicine will change how awake you feel. If you are taking armodafinil, don't drink booze.When armodafinil levels in the blood reached their peak, they went down in a single step, with a half-life of about 15 hours.