Thank you for your responses.
We called the vet again the day after Bailey started his meds. She told us to wait another day for the medication to work. He is still coughing, although not as bad but I'm worried that he may have something in his throat so today he will go back to the vet for sedation and and she will have a look. It's so hard to see him like this.
I will try to update again this evening. Again, thank you for your concern everyone.
Glenda