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Might be worth speaking to your pharmacist they might be able to research this for you ?
Hi, I’ve been tracking the ingredients of the brands I’ve been given so far, after the bad experience with different tamoxifen brands, and so far I’ve got these:

Each row is the same ingredient and the 2 highlighted ones are what I believe to be the same, albeit with different names.
I don’t know if any of those names refer to lactose or gluten, but at least you can check.