Anaesthesia / SECTIONS / By Classification: LA & GALA Types (Amide/Ester), Dose, Onset of Action, Duration of ActionAmide: an organic compound that contains a carbonyl group (-CO-) bonded to a nitrogen atom.Ester: an organic compound that contains a carbonyl group bonded to a second oxygen atom which is bonded to another carbon atom. R – CO – O – RGA componentslocal anaesthetic is an amide if there is an ‘i’ is before the ‘c’.