I THOUGHT I was taking ortho lo for the last two years since my gyno had told me that is what she called into Walgreens for me.. Walgreens then gave me the generic version (trinessa)... I just found out today that trinessa is generic for Ortho-Tricyclen and that there isn't generic for Ortho lo... I've developed melasma from all of the hormones and the pharmacist said that there is a significant difference between the two as far as estrogen levels. He didn't know the exact difference (or he was just too busy)... does anyone know? I wonder if my melasma will go away?