There should not be a difference in effects between Diane-35 and Cyestra-35 if the quantities of hormones in both products are the same. When doctors prescribe medications, they often write the brand name, but what truly matters are the active ingredients. Both products should have similar amounts of active ingredients, as well as similar effectiveness and tolerance. You can still choose to request the brand name product or try the generic version if you prefer. It is always important to consult with your healthcare provider if you have any concerns or questions about your medication.