Hi I was diagnosed with DCIS last year, I had lumpectomy but margins not clear so has mastectomy 1 boob oct 24. Tamoxifen was offered but from the research I did the benefits on DCIS seemed minimal and the side effects of the drug sounded awful so I decided not to take. I think you have to weigh up potential benefit with potential side effects and impact on daily life.
From the reading I did I concluded keeping healthy weight, not smoking, being active were more likely to reduce future risk.
Lots of grey areas with DCIS which I have found hard to digest. Having to decide to remove your boob for something that may never turn Invasive was hard but hoping the mastectomy has taken the chance of invasive cancer away.
Like you said you could try it and stop if it makes you ill??
I also spoke to one of the breast cancer now nurses.