Is it possible for arimidex to cause a rebound in estrogen in individuals who have never used steroids? I took 2 week of 0.25mg/day of arimidex in august (idiotic/desperate attempt to fix in a non invasive way) and had the surgery done in October. Is it possible taking two weeks of arimidex at that dosage can cause any type of regrowth in breast tissue? I'm just very worried I might have made a terrible mistake in taking a drug that I really should have known better not to. Thanks so much.