Vetrex is good for colds. Sulmet works for respitory issues as well as denagard. I have a sneezing birds used these 2 and went away quickly. I had a bird shipped from a good source but it was during a real wet period and he caught cold. Vetrex seems like eucalyptus and is a oil. Sulmet goes in the water. I used this just in case it was more than a cold. The Vetrex is what made him better. after I used that it went away in a few days. Good to keep on hand.