Alli is a low dose form of prescription drug Xenical which is also known as Orlistat. Since Alli is a variation of a widely used and successful drug you can be sure that it has been tested to ensure that it is as safe as possible. Also, you don’t have to worry about Alli being run by a fly by night operation. Alli is being marketed by GlaxoSmithKline.

While you can expect to lose 50% more weight while taking Alli, you may have a change in your bowel movements.