Need western medicines

Hello, im back in Vietnam for acouple of months.  I have back problems and get prescribed western medicines. When I  run out how will i be able to find medicines like hydrocodone or others like it?  I have only seen codine with tyenol as the strongest medicine in this country.  Does anyone know anything i dont? Is there anything I can do?

If anyone knows anything i will greatly appreciate it.  I have been taking pain relievers for many years now need them to function properly. Im basically disabled without them. Walking and sitting  becomes difficult.

Hi Jimmy,
Its not easy to look for some kinds of western medicines here. But let's try to ask at some medicine shops in Hai Ba Trung streets, district 1, near Tan Dinh market.
Last week my boss came here and didn't bring enough medicine like you, we wrote down those name and went a round city to ask almost all medicine shops that we could know, and then we found them at a Hai Ba Trung street store.
Best wishes
Trang