When my dog, Rosie, had the same problems at the same time, I was surprised when the Vet I'd used for years prescribed EXACTLY the same thing, same dosage, for Rosie, and years later, when our Molly began having the same symptoms her "Big Sister" and I did, our new Vet--recommended by my previous Vet when we moved 21 miles SW, also prescribed Chlorpheniramine Maleate for Molly and to continue with it for Rosie. It works exceptionally well with runny noses that seems to 'go down the wrong way' and set them to choking, and it alleviates their symptoms effecting their eyes. You can see why we buy the bottle of 1000 4mg pills.-- WE ALL HAVE TO RELY ON THEM FOR ESPECIALLY AIR-BORN ALLERGIES!
None of us have any side effects. It's an excellent product. At a more than excellent price!