Hi Renee, Thanks for the info. I do not know if you read my orginal post a few weeks ago called "Bad Cortef Batches", but I am also a pharmacist and that post will give you added info as to why I am looking into the Cortef suspension potency question. The representative at Upjohn told me the original date of application for re-formulation was in 1996, and he wanted to know if there were problems all the way back then. I really had no info about that until your letter.Thanks, I will let him know. Michele H.