Hazardous waste is any waste with properties that make it dangerous or are capable of having a harmful impact on human or environmental health. It can be generated from a vast variety of sources, including pharmaceutical waste.
The Resource Conservation and Recovery Act (RCRA) gets more specific in defining hazardous waste through four lists: P, U, K, and F. When it comes to hazardous pharmaceutical waste the P and U lists are relevant and the ones you want to pay the most attention to. Drugs such as warfarin, nicotine, lindane, and cyclophosphamide. Additionally, many drugs meet the definition of the different characteristic wastes (ignitability, corrosivity, toxicity, and reactivity) which all must be managed as hazardous waste.