•Generic drugs are required to have the same active ingredient, strength, dosage form, and route of administration as the brand name product. Generic drugs do not need to contain the same inactive ingredients as the brand name product.  •The generic drug manufacturer must prove its drug is the same as (bioequivalent) the brand name drug. For example, after the patient takes the generic drug, the amount of drug in the bloodstream is measured.  If the levels of the drug in the bloodstream are the same as the levels found when the brand name product is used, the generic drug will work the same. •Through review of bioequivalence data, FDA ensures that the generic product performs the same as its respective brand name product. This standard applies to all generic drugs, whether immediate or controlled release. •All generic manufacturing, packaging, and testing sites must pass the same quality standards as those of brand name drugs, and the generic products must meet the same exacting specifications as any brand name product. In fact, many generic drugs are made in the same manufacturing plants as brand name drug productsРазные производители, ингредиэнты  в генериk намного дешевле, но требование к свойству и действию должны соответствовать .ISO.Единственное жесткое требование в Америке-это к кардиостимулирующим препаратам...крутитесь производители, как хотите, но действие препарата должно быть соответствующим.