Ask most vets or farm managers what “compounding” means and they’ll talk about raw active ingredients. Grab a bulk antibiotic, throw in something else, hope the combo does more than either alone. Fair enough. But there’s a quieter version of this that happens in real poultry houses every day, and it gets ignored: combining finished veterinary formulations into one prescription. Get it right and it’s beautiful. Get it wrong and you burn birds, money, and organ function. I want to walk through one prescription I keep coming back to. It shows what works, where it falls apart, and the two swaps that trip people up most. What the prescription is…