I have been on arixtra for several years and am satisfied with this brand name drug, but this I have been informed by my drug plan that I must change to the new generic form which came on the market Nov. 2014. Under the chemical name of fondoperinux.. I can not find any discription of the difference between the two e.g. Ingredience and supply format. Arixtra is pre filled needles of 7.5 mg.......can you direct me to a site were this info is available ?