A chemical substance that elicits specific pharmacodynamic and pharmacokinetic effects when introduced to the human body via a variety of routes of administration. DrugBank includes approved drugs, withdrawn drugs, potential drugs that are currently being investigated in clinical trial and putative drugs at very early stages of research. 

Each drug in DrugBank is associated with a unique identifier that starts with "DB" followed by 5 digits. For example the code for Abacavir is DB01048.