Serrapeptase was a wonder for my cat with Asthma! Prednisone almost killed him, ended up in the hospital with his liver failing, kidneys were also affected. They took him off Prednisone, but we were still told that the prognosis was grim. He is old, but now alive and well (knock wood). Just give your cat maybe 20,000 SU. You have to buy the minimum strength of 40,000 (on-line). I emptied the capsule and gave half. Good luck!