I had been doing some research on Bipolar disorder and MS. It seems to be common among those with MS to have both. Studys show that usually those that have both diseases, usually the Bipolar preceeds the ms diagnosis. With that being said, I can attest to the studies concerning these disorders and those who are taking Avonex. Avonex is a prescription drug to treat ms and is done by injection. A heed of warning on this however. If you are suffering with Bipolar disorder I would think twice of taking Avonex. A rare but definate side affect of Avonex is suicide. I found this out after taking it for a month. Not only did the flu like symptoms come but so did severe depression, followed by the feeling of wanting to die. My neuro got me off of it needless to say. So I would suggest doing your own research if you do indeed have Bipolar disorder, and are considering Avonex.