Why Chinese need lower doses of some medications? Is that only because of lower body mass?

Question

Thank you for your help

Answer 1

Could also be due to dietary differences.

Western diets tend to have more fat in them, which affects what you can digest and how well.

Answer 2

Some drugs are not metabolised very well in some groups, like asians, I will try to find an example.

see below:
http://www.merck.com/media/mmpe/pdf/Table_302-3.pdf

many asians have less active alcohol dehydrogenase.

Answer 3

Yea i guess, only reason i can think of