Id suggest you read through this old thread on Imitrex. It was very interesting.
http://www.medhelp.org/posts/Addiction-Substance-Abuse/Imitrex---addicting-or-not/show/626880
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Here's a couple of the responses in the thread:
By: masteele80
here is the lay of the land by someone who has taken almost everything.
Anything, yes, anything - that changes your mood, alters your personality, or changes the way you feel, or sense pain - will, can and is addicting.
Opiods will be more addicting, because they make you feel good. Ultram is addicting because it numbs and calms your senses. Imitrex doesn't feel addicting, but it affects your mind, and yes, can be addicting to many people.
Again, anything that affects your mood or changes you - can be addicting. Everything from Allergy Pills, to cough syrup, to percocet, to sniffing glue - can be addictive. Just because the research doesnt support it at this time, doesn't rule it out.
By: HR_PuffnStuff
It's not addictive BUT I will say that I heard from a neurologist that if you take it too often, it can definitely cause a "rebound" situation. He said your body knows you are going to take it. I used to take it almost daily and after I heard this (that combined with the cost) I went cold turkey for about two weeks. I had some rough days but the headaches I did have were contained with ice, laying down, dark room, etc. When it would get really bad I would take Benedryl to knock myself out and just go to bed. Sometimes at like 8 O' clock at night! Giving it up c/t was the best thing I ever did. Now i only have an actual migraine like once every two weeks or so. So themom3, you may definitely tell your daughter to try this. I can't tell you how great it feels not to have a headache every day. Oh and just so Y'all know...Imitrex now has a generic so it is much more affordable. Yeah!
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Your question is definitely something worth researching a little more. Maybe address your concerns with your prescribing doc.