migraine
"I have been diagnosed as having New persistent daily headache. That means every single day, ALL day for the last 5 years I've had a headache that varies from just a headache to a full on borderline debilitating migraine. 
I have noticed that this medicine does offer some relief for me. I am sensitive to a lot of medications and also allergic to many.  I noticed with this medication, when I do take it, I often feel like I want to take more. Even after the medication has made my headache tolerable I literally think about this medication. To me, that shows it can definitely have some addictive tendencies and for a person whose condition is not likely to go away this could be a real issue. this is more for a once in a while migraine."