No, it isn't. Trastuzumab is the active ingredient in Herceptin, but it is not a generic version of Herceptin. What can be confusing is that, oftentimes, the active ingredient of a drug is referred to as the generic name..The generic name is different than a generic version of a medicine.In order for there to be a generic version of a medicine, the original medicine must have gone off patent and another company (besides the original manufacturer) would make the product.he generic name is different than a generic version of a medicine. In order for there to be a generic version of a medicine, the original medicine must have gone off patent and another company (besides the original manufacturer) would make the product.