10 week puppy had a cold when I bought her 5 days ago.. I took her to the vet yesterday and she prescribed her antibiotics... she didn't eat much today before I gave her the meds and 1hr later she threw up... now she's not doing anything, no playing, eating but she drinks water... please help

Did the vet say what the actual problem was?

How are her stools? Any diarrhea?

One day on anti-biotics isn't going to make her improve much but if she has deteriorated rapidly in the past day I would be racing her back to the vet personally. There are too many nasty diseases and viruses that can be deadly to young pups.

Also, have you contacted the breeder?
If the pup already had a 'cold' when you bought it then the breeder should be covering your vet bills.

Was the dog vomitting before the antibiotics? They may not be sitting well with her, you may need to go back and get a different kind.