i gave her a couple of spoonfulls (wooden spoon) she just licked it off. seemed to help a bit - she has had to go on antibiotics now as coughing mucus. its worth a try before getting antibiotics if its bad.
i hadnt heard of it either but the vets say benylin all time apparantly?
My vet said exactly the same. It works brilliantly. You'd be suprised what you can get from even the supermarket for pennies and the vets will charge you loads for!
I use NAF 5 star respirator for a dust allergy, depends why its coughing, my pony I had in the 70's had benelyn on a vets advice, not sure it worked I was only 7 ish then !