Generics Are Not Tested for Safety and Efficacy
Although the FDA gives assurances as the safety and efficacy of generic drugs, generics do not undergo human testing to assure that they are safe and effective. The thinking is that since the active ingredient is the same as in an approved brand name drug (which was tested for safety and efficacy) and it is released at roughly the same rate, it should behave the same way in the body. For the reasons noted below, this reasoning may not always be correct.

I have been having allergic reactions to some antibotics, and have had some of the negative side effects to changes to generics blood pressure pills in the past. A pharmacist once suggested that possibly I was experiencing reactions to the different fillers or presevatives? Not sure exactly of his terminology, but just looking at the different ingredients and suspicions about mercury etc in vacinations, I wonder if the ingredients are all exactly the same in generics, and if so why are they so much cheaper? IF fillers and preservatives or whatever are slightly different or changed because cheaper, could people have alleric reactions to slight or different chemicals in generics and name brand? I have been told to go to a allergist and have tests for antibiotics. But what else should I request especially when I have had a life long problem with skin reactions to metal and certain synthtics??
So drug companies are going to make products that kill their customers and thus cut their revenue? You'll need to come up with something more plausible than that.