Very Sick two week old chick...

I have a two week old chick that is gasping,wheezing and sneezing..I currently have it on duramyacin(sp?)-10 and started using VetRx along with the d-10 as d-10 alone wasnt noticing much change..anyone else having this problem and what are you currently using to help your baby(ies).TIA Jamie

 ps- Poop normal looking  current brooder temp 85 feed and water consumption lacks a little