When was the last xray taken? Is there crackling in the chest? If the initial problem was pnemonia, this is difficult to get rid of. As mentioned, allopathically, specific antibiotics must be used, but most importantly, treatment must be elongated to a minimum of 4 weeks, otherwise the condition will return. I know this is a very stressful and difficult condition. This past fall, we discovered that one of our cats was FIV positive and we needed to intensively treat him, no less than 4 times for his pnemonia.

Actual respiratory ailments can be difficult to treat as Shirley points out, but I think you need to reveal the actual nature of the complaint (cause) if you can, as well as the symptoms of the cat, keeping in mind that many cats will have a lot of symptoms in common, you need to notice the uncommon ones as well.