if you are in the veterinary field, you need this book!! I have bought the newest edition of Plumbs as each one has come out. If a medication is used in veterinary treatments, approved or not for animal use, Plumbs will tell you everything about that drug. Drawbacks, cautions, dosages,(including which dosage for different species, as well as dosages for different problems). I have been a vet tech for close to 30 years, and this is the best drug referance I have ever used.