I am on Tamoxifen and was upset by the receding hair line, loss of hair (as seen in the bath) and disappearing eyebrows and lashes.
I now use UKLash for brows and eyelashes with a noticeable improvement. Not cheap and you have to continue using it while on treatment but it lasts a long time.
I also use Regaine (sold through Boots and others) along my front hairline and have seen noticeable regrowth. Enough to make me feel better anyway.