I adopted a cat about 5 weeks ago from a shelter. Soon after having the 5 month old tabby home she started coughing, almost like "hair balls." Having another cat in the home I took her to the vet. The vet said it was common for "pound" cats to have Feline Upper Respiratory Infections. M.J. "the new cat" that had no other symptoms should recover on her own, the incubation period of 2 weeks. If other symptoms occurred she needed anitbotics, and I could get them at our local feed bin. It has now been 5 weeks and M.J. is still coughing, and my older cat which is now 7 is coughing. I know I need to start her on anitbotics which one works best?