It seems that Bitter Orange (Citrus aurantium aka sour orange, bigarade orange and Seville orange) is the “other” ephedra, and as such has similar side effects. Natural remedies for losing weight that have Bitter Orange in them are marketed as Ephedra Free when in reality their chemical make up is almost a mirror image of the ephedrine in Ephedra. This is just one reason why you need to be carefully reading labels and researching ingredients on any product you are considering for your weight loss journey.

http://letdiet.blogspot.com/2008/03/bitter-orange-new-remedy-for-weight.html