My hormone therapy was delayed by 3 weeks because my oncologist didn't have an available appointment to see me in until then and prescribe it.
Carrying prescription medication into China is perfectly legal and you shouldn't have any problems, simply carry it in original packaging.
Noting to represent that some of us do get side-effects: Two weeks after starting on Tamoxifen my mood was altered and sleep disrupted. Frustration and apathy were my two dominant moods until precisely one month after starting treatment in which I experienced what I will describe as a crippling depression. Nearly 8 weeks along and seems to have cleared up, still queen of the cranky, but am experiencing increasing abdominal pain (which I now know may indicate ovarian cyst growth) and even on this bloody diet of salads appear to be to be gaining weight! rant rant rant-rant-rant!