Budesonide. Molecular model of the drug budesonide (C25.H34.O6). This drug, sold under the brand name Pulmicort, is a steroid medication. The inhaled form is used in the long term management of asthma and chronic obstructive pulmonary disease (COPD). Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white) and oxygen (red).