I took Tamoxifen back in 2003, when I had DCIS. I took it for 3 1/2 years. I told my oncologist it was affecting my hair. If I remember correctly (that was many moons ago) my hard turned dry and brittle breaking off. My oncologist said take a break from Tamoxifen- if your hair gets better you can stop tamoxifen & if not just finish out the 5 yrs. I just quit it after the 3 1/2 years. My hair turned healthy again.
What is interesting is the oncologist I’m seeing now told me they did a study / he said probably 20 yrs ago - that on the same timeframe I was taking it - & the study showed no effect on hair 🤷‍♀️
We have to do what is best for us & our bodies …and … Quality of Life.