Collapsed trachea in small dog

[Mowser]

My neighbour's Yorkshire Terrier (Ollie) has a collapsed trachea. He's to have cough suppressants and a bronchodilator.
Is there a cough suppressant available in the chemist that would be suitable?
Likewise, is there a bronchodilator in the chemist's he could use.
I'm asking this as the dog equivalents are rather expensive.
(Ollie needs to be fixed as his cough is driving me nuts!)

Thanks

[Julie]

Our local vet sends us to the chemist for animal medicine if its cheaper, maybe ask him/her I feel sorry for the dog .