how soon to Tamoxifen side effects start?

LL99LL

Hi everyone,

For those of you who've been on Tamoxifen, can you let me know how long it took for you to start having side effects? I started taking it 5 days ago and I've been very lucky so far to not have any problems. I'm asking because I'm going to start another medication, unrelated to breast cancer, which has some of the same side effects as Tamoxifen. The second medication was prescribed by a different dr who said it should be clear whether I'm having Tamoxifen side effects by day 4 or 5. So the dr said to add the second medication after 5 days on Tamoxifen. That seems like it might be too short of a turn around. If I do end up having side effects, I'd really like to be able to figure out which medication is causing what. (By the way, both drs have said there are no drug interactions between these two meds to worry about.)

Thanks for sharing your thoughts.