A machine for preparing intravenous medicaments including an enclosing structure having a plurality of lateral walls arranged to define a closed internal working environment. An access station affords selective access to the closed internal working environment. One lateral wall is an equipped wall on which there are defined a plurality of stations for objects used in the preparation of intravenous medicaments. The stations on the equipped wall include temporary receiving or parking stations for the objects and operating stations for carrying out operations on the objects. A handling robot is programmed to transfer the objects from any station to any other station. The machine includes a metering module with one or more container support groups, a syringe support/metering member group, and a weighing group for weighing objects used in the preparation of intravenous medicaments.