Bring medication into china

Here is my recommendation:
Bring 2 copies of your prescriptions along. Things happen and although you do not plan to lose or have your medication destroyed it can happen so bringing along these prescriptions will help you out in case of emergency. You may need to show your prescription at security check points.
Do not check any of your prescription medication. Put it all in your carry on luggage. Split it amongst your carry on luggage. If you have a hand bag keep a few months supply in your handbag. Keep a list of name and address and telephone number of both your home country Pharmacy and your home country Doctor.
Make sure all of your medication(s) are in their original packaging. This is one of the most painful parts as pharmacies love to put a few small tablets in a huge bottle. Security can and sometimes do check at various checkpoints that the name on the medication is exactly as the name of the passenger.
If the supply is quite bulky, have your doctor write a letter that you will be in China for X days and he wants you to have sufficient medical supplies and medications for this period.