Designing a pharmaceutical cleanroom isn’t just about building walls and installing filters—it’s about meeting strict regulatory standards that ensure safety and compliance. Two of the most important guidelines in this space are USP <797> and USP <800>.
Both play a critical role in how you handle sterile and hazardous drug compounding, but they each focus on different risks. Whether your facility handles one, the other, or both, understanding how these standards overlap and where they don’t is key to building a safe, efficient, and compliant operation.
USP <797> Compliance & Guidelines
USP <797> is all about sterility. If your pharmacy or lab compounds sterile products—like injections, IVs, or eye drops—this is your go-to standard. It’s designed to protect patients from harmful contamination.
Here’s what USP <797> means for your cleanroom design:
- Cleanroom classifications: Buffers and anterooms must meet ISO 7 and ISO 8 standards to control particles.
- Positive pressure zones: These spaces are pressurized to push out contaminants and keep clean areas protected.
- HEPA-filtered airflow: You’ll need high air change rates with HEPA filters to maintain clean air.
- Defined zones: Gowning, staging, and compounding areas must be clearly separated to maintain unidirectional flow.
- Easy-to-clean finishes: Materials must be seamless, non-porous, and easy to disinfect.
In short, USP <797> focuses on maintaining cleanliness and sterility at every level of the environment.
USP <800> Compliance & Guidelines
USP <800> shifts the focus to safety and containment. If you’re handling hazardous drugs, this is the standard that protects your staff, your patients, and the environment.
Here’s what you need to know about USP <800> design:
- Negative pressure rooms: These prevent hazardous vapors or particles from escaping into other areas.
- Dedicated ventilation: Air must be filtered through HEPA and vented outside—no recirculation allowed.
- Separate storage: Hazardous drugs must be stored apart from everything else, usually in ventilated enclosures.
- Containment engineering: Buffer rooms or compounding areas must maintain negative pressure and controlled airflow.
- Anterooms and airlocks: Like <797>, but with added protections to keep hazardous materials contained.
While USP <800> shares a few design principles with <797>, its overall goal is different: containment and safety, not just cleanliness.
Key Differences between USP <797> & USP <800>
Now that we’ve covered the basics, here’s a quick breakdown of the key differences between the two standards:
| Category |
USP <797> (Sterile Compounding) |
USP <800> (Hazardous Compounding) |
| Primary Focus |
Preventing microbial contamination |
Containing hazardous drugs and protecting staff |
|
Key Standard |
USP <797> | USP <800> |
| Environment |
ISO 5 PEC in ISO 7 cleanrooms, positive pressure |
ISO 7 cleanrooms, negative pressure |
| Protective Gear |
Full sterile PPE |
Chemo-rated PPE, face/eye protection |
| Air Handling | HEPA-filtered, controlled positive airflow |
HEPA-filtered, externally vented, negative airflow |
| Risk Level | High (risk of infection) |
High (risk of toxic exposure) |
Need to Follow Both Standards? You’re Not Alone.
Many facilities need to follow both USP <797> and <800>—especially if you’re compounding sterile, hazardous drugs. That’s where cleanroom design becomes even more critical. You’ll need zones that meet both sterility and containment requirements, often with specialized pressure differentials and air handling systems.
Work with Experts Who Know the Standards Inside Out
At Flow Cleanrooms, we specialize in designing and building cleanrooms that fully comply with USP <797> and USP <800>. Whether you’re starting from scratch or upgrading an existing space, we help you create environments that are safe, efficient, and inspection-ready.
Let’s build a space that works as hard—and as safely—as you do.
