Duphamox LA Further information After the administration of Duphamox LA, amoxicillin is absorbed and widely distributed in the body and high levels are found in kidney, urine, liver and bile. Amoxicillin has a rapid bactericidal action which normally prevents the recrudescence of respiratory infections. As with other penicillins, absence of toxicity is normally encountered. Animals with functional rumens should only be treated parenterally. Disposal: Dispose of any unused product and empty containers in accordance with guidance from your local waste regulation authority.