I will fly with Cathaway Airline via Hong Kong to Changsha Airport.

And will be carrying medication in my luggage for my year's stay in Changsha. Cathaway advised that I am allowed to carry my medication in my check-in and carry-on luggage as long as it is accompanied by a letter from a doctor. But they can't tell me if it will be allowed through customs at Changsha when I collect my luggage.

Can anyone advise if there are any restrictions on carrying medication?

Thank you.