USP 797 vs. USP 800: What Changes in a Pharmacy Build

2 days ago

6 min read

Compliance reviewed by Onur Oncer, SDVOSB Materials compliance lead.

A sterile compounding suite built to United States Pharmacopeia (USP) General Chapter 797 protects the preparation. Add hazardous drugs and Chapter 800 applies, which means protecting the person and the building as well. The airflow reverses. LabTECH Environments, the laboratory division of SDVOSB Materials Technology & Supply LLC, specifies both, and the delta between them is mechanical.

Positive Pressure Protects the Product. Negative Pressure Protects the Person.

Everything else follows from that. A non-hazardous sterile buffer room is held positive to the spaces around it so room air cannot drift in and contaminate what's being prepared. the Occupational Safety and Health Administration (OSHA) guidance on controlling occupational exposure to hazardous drugs puts that at a positive pressure of at least 0.02 inches of water column relative to adjacent unclassified areas.

A hazardous drug compounding room does the opposite. It's held negative, between 0.01 and 0.03 inches of water column to adjacent areas, so drug aerosol stays where it was generated. You're not keeping the world out. You're keeping the drug in. Two rooms, opposite pressure signs, one facilities team holding both across a shared wall.

That reversal is why the mechanical scope, not the casework package, is where a pharmacy schedule slips. Still deciding what kind of controlled environment you're building? Start with the federal laboratory procurement guide.

What Actually Triggers Chapter 800

Chapter 800 doesn't switch on because a pharmacy is busy or because the building is federal. It switches on because of what's being handled. The reference point is the National Institute for Occupational Safety and Health, which publishes the NIOSH List of Hazardous Drugs in Healthcare Settings, 2024, publication number 2025-103. It names the drugs NIOSH treats as hazardous and flags those carrying manufacturer's special handling information.

Pull that list before anyone draws a room. A facility handling one antineoplastic agent that requires manipulation is in a different construction project than one that only counts and repackages final dosage forms, and the difference shows up as a separately ducted exhaust riser. Write the furniture package first, check the drug list second, and you re-bid the mechanical scope.

The Four Additions That Change Your Equipment List

Each row below names the requirement, then what a 797-only sterile suite calls for, then what changes once Chapter 800 applies. Figures are as OSHA states them; ISO classes are International Organization for Standardization air-cleanliness classes.

Buffer room pressure. Positive, at least 0.02 in. w.c. to adjacent unclassified areas. Negative, 0.01 to 0.03 in. w.c. to adjacent areas.
Primary engineering control. An ISO Class 5 device sized to the workload. A containment primary engineering control (C-PEC), externally vented for sterile work.
Secondary containment. The buffer room and ante-room themselves. A containment secondary engineering control (C-SEC), externally vented through high-efficiency particulate air (HEPA) filtration, in a different room from other preparation areas.
Air changes per hour. Set by the ISO classification assigned to the room. 30 for an ISO Class 7 containment buffer room, 12 for a containment segregated compounding area.
Bulk storage. Shared pharmacy stock. Externally vented negative-pressure room, at least 12 air changes per hour, separated from non-hazardous stock.

Four of those five are ductwork, fans and controls. One is a device you can put on a purchase order. Procurement usually gets that ratio backwards.

The Segregated Compounding Area Is the Cheaper Room, and It Costs You Dating

The containment primary engineering control can sit in one of two places: an ISO Class 7 buffer room with an ante-room, which is the preferred arrangement, or an unclassified containment segregated compounding area. The segregated area needs 12 air changes per hour instead of 30. Smaller air handler, smaller bill.

Here's the cost. A preparation compounded in a segregated area carries the beyond-use date Chapter 797 permits for that setting. You bought capital savings with shelf life. For a facility batching a day's doses that trade is often fine. For one that needs longer dating, it isn't, and finding out after the ductwork is hung is expensive. Ask the pharmacy director what dating they need before anyone sizes an air handler.

Storage Is a Separate Room, Not a Separate Shelf

The requirement people miss is storage. Antineoplastic hazardous drugs requiring manipulation, and any hazardous drug active pharmaceutical ingredient, are kept apart from non-hazardous stock in an externally vented negative-pressure room with at least 12 air changes per hour.

That's a second ducted room, and it rarely shows up in an early budget because it looks like shelving. Shelving is the cheap part. The exhaust penetration, the pressure monitor and the door hardware are not.

Who Owns the Pressure Reading at Handover

Split it on paper before award. The equipment supplier delivers and installs the containment cabinet or isolator and provides its certification. The mechanical contractor delivers the room: exhaust path, fan, controls, pressure differential. Neither alone hands you a compliant suite, and a solicitation assuming the cabinet vendor will make the room work ends in a dispute.

Write the acceptance test into the award. Name who takes the reading, at what door positions, with the cabinet running, and what it has to show. Same commissioning discipline that governs fume hood and air safety equipment on the chemical side of the building, and it fails in the same place: closeout.

One caveat, plainly. USP revises these chapters, and OSHA's guidance summarizes a particular edition. The numbers and room names are not frozen. Name the revision in effect at award and require certification against it, not against a summary. If the project team can't say which edition they priced, resolve that first.

What LabTECH Environments Supplies for a Pharmacy Fit-Out

LabTECH Environments plans, provides, installs, tests and certifies laboratory and pharmacy environments, including compounding and hospital pharmacies, cleanrooms and modular lab spaces. Containment cabinets and lab safety enclosures come through Baker, cleanroom envelopes through NICOS Clean Rooms, casework through ONEPOINTE Solutions, instrumentation through ThermoFisher Scientific. Verified past performance includes lab work for the U.S. Department of Veterans Affairs, Johns Hopkins University, Stanford Medical, and the City University of New York and State University of New York systems. Adjacent decisions sit in the biosafety containment tier and ducted versus ductless hood comparisons; the full division scope is on the LabTECH laboratory page.

SDVOSB Materials Technology & Supply LLC is certified under the Small Business Administration (SBA) Service-Disabled Veteran-Owned Small Business program and as an SBA HUBZone small business, holds a Lab & Health certification, and is a certified Small Disadvantaged Business, 100% Veteran Owned and 100% Disabled Owned. All of it is verifiable on the SBA Small Business Search profile. The company does not hold its own General Services Administration (GSA) Schedule; GSA orders run through GSA-registered partner vendors. It does hold The Interlocal Purchasing System (TIPS) contract 230701.

Frequently Asked Questions

Does every compounding pharmacy need a USP 800 build-out?

No. Chapter 800 attaches to the drugs, not to the pharmacy. A facility that handles nothing on the NIOSH List of Hazardous Drugs in Healthcare Settings can build a Chapter 797 sterile suite and stop there. Once a listed hazardous drug is received, stored, compounded, dispensed or administered on site, the containment obligations follow it into the building.

What is the difference between a C-PEC and a C-SEC?

The containment primary engineering control is the device: the ventilated cabinet or isolator the work happens inside. The containment secondary engineering control is the room that device sits in, with its own pressure regime and exhaust. You buy the first one. You build the second one. Confusing them is the most common reason a hazardous drug suite arrives incomplete.

Can the hazardous suite share a room with non-hazardous compounding?

No. The containment secondary engineering control is physically separated from other preparation areas, meaning a different room. How the ante-room and pressure cascade sit around that separation depends on the layout and the chapter revision in effect, so make the mechanical engineer show the full cascade on the drawing instead of describing it in a narrative.

Is a containment segregated compounding area actually cheaper?

In capital cost, usually yes. It calls for 12 air changes per hour rather than the 30 an ISO Class 7 containment buffer room needs, which shrinks the air handler and the ductwork. The cost lands elsewhere: preparations compounded there carry the shorter beyond-use dating Chapter 797 assigns to a segregated setting. Confirm the dating your operation needs first.

Does Chapter 800 apply to non-sterile compounding too?

Yes. Non-sterile hazardous drug compounding is performed in a containment primary engineering control such as a Class I biological safety cabinet or a containment ventilated enclosure, placed in a containment secondary engineering control that is externally vented, at 12 air changes per hour and at negative pressure. The device changes. The requirement for a contained, vented room does not.

Quote a Compounding Pharmacy Fit-Out

Building or upgrading a compounding pharmacy for a federal, state, or institutional contract? Email LabTECH@SDVOSBmaterials.com, call (917) 216-9400, or use the contact page. Send the drug list and the dating you need, and we'll scope the equipment and the room together.

UEI K39HBMPLN4B3 | CAGE 7YX60 | EIN 82-2895228. Registered active on SAM.gov. Certified veteran-owned business through the National Veteran-Owned Business Association.