Understanding hazardous drugs starts with the criteria set by NIOSH. NIOSH defines which drugs pose an occupational health risk and provides guidelines and a Hazardous Drugs List to identify them. The criteria cover properties like carcinogenicity, teratogenicity or reproductive toxicity, organ toxicity at low doses, genotoxicity, or other similar hazards. When a drug meets these criteria, healthcare facilities implement containment measures, engineering controls, and appropriate PPE to protect workers. Other agencies have different roles. OSHA enforces workplace safety standards and may reference NIOSH guidance, but it does not establish the drug-specific criteria itself. FDA handles drug approval, safety, and labeling, not the criteria for handling hazardous drugs. EPA governs environmental hazards and pesticides, not occupational handling of medicines. So the organization that provides the criteria to identify hazardous drugs is NIOSH.

The main idea is to prevent cross-contamination by keeping hazardous drug (HD) materials contained and physically separated from other areas. When equipment and storage are dedicated to HD work, residues, spills, and emissions are less likely to move into non-HD spaces, surfaces, or products. This containment protects staff from exposure, helps maintain a clean, controlled handling environment, and supports regulatory requirements for safe HD handling. While organized inventory management can be a helpful side effect, it isn’t the primary reason for dedicated HD equipment and storage. Reducing PPE usage isn’t the main goal either, since PPE is part of protecting the worker regardless of containment systems. Allowing shared use with non-HD areas would undermine containment and safety standards, which is why it’s not compatible with the purpose of dedicated HD areas.

Handling chemotherapy drugs creates a real risk of skin exposure and environmental contamination. The gown serves as the outer barrier, but its protective effectiveness diminishes over time as drugs can permeate and the fabric becomes contaminated with repeated handling. Changing the gown every 2 to 3 hours maintains that barrier integrity and helps keep exposure risk low. If a spill occurs or the gown becomes visibly contaminated, change it immediately. Longer intervals like 6–8 hours, daily, or weekly allow contaminants to accumulate and increase the chance of skin contact or cross-contamination. In busy work settings, 2–3 hours is the standard minimum to balance safety with practicality.

Gowns used when handling hazardous drugs must provide a true liquid barrier to prevent permeation of cytotoxic agents. Polyethylene-coated polypropylene delivers that barrier: the sturdy polypropylene fabric is laminated with a thin polyethylene film, creating a surface that resists penetration by liquids and drug solutions while remaining disposable and relatively comfortable for use during preparation and administration. Cotton would absorb spills and can harbor contamination, increasing exposure risk. Non-woven polyester by itself does not guarantee a reliable liquid barrier unless it’s coated or laminated with a barrier film. While polyurethane can provide impermeability, chemotherapy gowns are typically made from polyethylene-coated polypropylene because it offers strong liquid barrier protection, durability, and cost-effective disposability.