I have been on brand name and recently because of insurance had to go to generic. I know we are all different and that goes for medication. I can tell the difference! Impax generic, can tell a difference but worked. Actavis can’t even tell I took anything. My son had been on brand until two months ago, insurance decided they wouldn’t pay for brand even if it was medically necessary. Impax does nothing for him, his grades have went down a lot. Going to see if his doctor will write for brand Mydayis by Shire. This is crazy!