Old School Versions are pills that come in different combinations of estrogen and progesterone. Some may be progesterone only pills. At any rate, these pills have been around since the fifties when BC was first started (not that long ago if you really think about it) and they have much less side effects. Even new versions of the pill like Ortho-tricycline does harsh things to the lining of your uterus. So if you really want to know the low down, ask your GYN.
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