I realize you may not be able to answer this question – not being a veterinarian – but thought Id try anyway: My elderly (18-year-old) cat has chroni

I realize you may not be able to answer this question - not being a veterinarian - but thought Id try anyway: My elderly (18-year-old) cat has chronic nasal congestion. It does not respond to antibiotics - L-lysine - antihistamines - oral homeopathic drops - prednisone or saline. Are any of your products safe and effective for cats? Thank you!