I am 59, started Tamoxifen three weeks ago. I actually have stage four breast cancer and am on a break from chemo right now (cancer is stable) so they gave me Tamoxifen , the metastasis is in my bones. I take it at bedtime because it makes me a bit dizzy and sleepy so that’s what the pharmacist said to do. I had an upset stomach the first week, but it seems to have balanced out now and I really can’t say I have any issues. Good luck.