Direct-to-patient compounding has made cold chain a core pharmacy discipline rather than a specialty-distributor concern. GLP-1 injectables, many hormone preparations, ophthalmics and biologic-adjacent products are labelled for refrigeration, and the pharmacy that ships them is responsible for the temperature they experience until delivery. Failures are expensive twice: the replacement, and the question of whether the first shipment was administered. This guide covers the definitions, the standards, how to qualify a packout, how to choose carriers, what to do with an excursion, and what the record has to show.
The temperature definitions
Storage labels use USP definitions, and a shipping programme is built on them.
| Term | USP definition | Practical note |
|---|---|---|
| Refrigerated (cold) | 2 °C to 8 °C | The default for GLP-1s, insulin analogues, many injectables and ophthalmics; freezing is usually as damaging as heat |
| Controlled room temperature | 20 °C to 25 °C, with excursions permitted between 15 °C and 30 °C and mean kinetic temperature not exceeding 25 °C | Most creams, capsules and troches; still needs protection from summer truck temperatures |
| Frozen | −25 °C to −10 °C | Dry ice packout; hazardous-materials rules for the dry ice itself |
| Cool | 8 °C to 15 °C | Rarely labelled; treat as refrigerated unless stability data says otherwise |
| Mean kinetic temperature (MKT) | A single calculated temperature that represents the cumulative thermal stress of a series of readings | Used to judge excursions against stability data; not a licence to average away a spike |
What the standards expect of a shipper
For compounded sterile preparations, USP <797> (2023) requires that packaging maintain the CSP's physical integrity, sterility, stability and purity during transport, and that the compounder select transport modes and packaging appropriate to the CSP's storage requirements and the conditions it will meet, with a written procedure. USP <795> has the equivalent for nonsterile preparations. USP <1079> goes further into how: qualify the shipping system against the temperature profiles it will meet, monitor where the risk justifies it, define what happens on an excursion, and keep records. Accreditors (PCAB, URAC, ACHC) audit against these. For a 503B, distribution is also a cGMP matter under 21 CFR 211.150, which requires storage and shipping under conditions that do not affect identity, strength, quality and purity.
Qualifying a packout
A packout is a specific configuration: this insulated shipper, this many gel packs conditioned to this temperature, this arrangement, this product load, this duration. It is qualified by putting a temperature logger in place of the product and exposing the packed shipper to a defined ambient profile in a chamber, then confirming the payload stayed within range for at least the transit duration you will ship. The profiles most shippers use are the ISTA 7E thermal profiles for summer and winter, or profiles derived from your own lanes. Qualify the configurations you will actually use — 24-hour, 48-hour and 72-hour durations, summer and winter — and record the result for each. Then re-qualify when anything changes: shipper supplier, gel-pack size, conditioning procedure, or product volume. A packout that keeps 2–8 °C for 48 hours in a 22 °C warehouse and fails in the first hour on a July dock is not qualified; conditioning of the gel packs (frozen versus refrigerated, and for how long) is where most configurations go wrong, and freezing the product with over-frozen packs is a common finding.
- ✓One written packout specification per configuration: shipper, coolant type, quantity, conditioning, arrangement, allowed product load, qualified duration, season
- ✓Chamber qualification against summer and winter profiles for each duration you ship, with the logger data retained
- ✓Pre-conditioning procedure for coolant with time and temperature, and a check that packs are conditioned before use
- ✓Re-qualification triggers written down: supplier change, component change, load change, procedure change
- ✓Periodic ride-along loggers on real shipments to confirm the qualification holds on your lanes
Lanes, carriers and service levels
A lane is an origin, a destination area and a service. The transit time on that lane, plus the time between packout and carrier pickup and the time between delivery and the patient opening the box, has to fit inside the qualified duration with margin. Choose the service per lane, not per pharmacy: overnight for long lanes and summer, two-day where the lane and season allow. Avoid shipping refrigerated product on a Friday for a Monday delivery unless the packout is qualified for 72 hours and the carrier's Saturday and Sunday handling is understood. Watch carrier hold-at-location and address-correction behaviour, which add days invisibly. Carrier scan data is the record of where the parcel was and when; collect every scan and keep them.
The process failures, and the controls for each
| Failure | Cause | Control |
|---|---|---|
| Cold product packed at an ambient station | Nobody told the packer | Packout is a property of the order, set from the product's storage condition, and the station sees it |
| Refrigerated lot stored on a general shelf | Receiving put it where there was room | Putaway rule assigns cold or frozen locations from the material's storage condition and records the reason |
| Under-conditioned gel packs | Rushed packout at end of day | Conditioning procedure with a check; shipper batches conditioned ahead |
| Slow service into a heatwave | Default service on every order | Service level chosen per lane and season; overnight where the qualified duration demands it |
| Parcel waits over a weekend | Friday ship on a two-day service | Ship-day rules per service; Saturday delivery where offered and qualified |
| Delivery marked twice, or lost early scans | Carrier webhook retries appended blindly | Scans stored one row per carrier event with a unique index |
| Excursion handled by guesswork | No stability data and no procedure | Written excursion procedure with the data to decide; deviation raised and closed |
Excursions: deciding with data
An excursion is a period outside the labelled storage range. Whether the product is still usable depends on how far, for how long, and on what the stability data says. Commercial products carry manufacturer guidance — several GLP-1 pens are labelled for a limited period at room temperature after dispensing — but a compounded preparation has only the stability data behind its BUD, and that data rarely covers excursions unless you commissioned it to. Decide in advance, in a written procedure: which excursions are automatically discarded (any freezing of a protein product, for example), which are evaluated by the pharmacist against the data, and who signs the decision. Calculate MKT where the data supports it but do not use it to average away a spike above a known degradation threshold. Every excursion is a deviation with a category of temperature excursion, a linked lot or order, and a root cause: the packout, the lane, the conditioning, the carrier. Repeated excursions on one lane are a CAPA, and the CAPA's effectiveness is checked before it closes.
Set up cold chain as a property of the order
We will receive a refrigerated lot, watch putaway send it to cold storage, place an order, see the cold-chain packout on the station, ship it and watch the carrier scans arrive — on live software.
The last hundred feet: the patient
The qualification ends at delivery; the patient's porch does not. Tell the patient when the parcel will arrive, what it looks like, and to refrigerate on receipt; include an insert with the storage instructions and what to do if the coolant is fully thawed or the product looks wrong. Where the lane is long or the address is a business, require a signature or use a hold-at-location option that is climate-controlled. A visible temperature indicator in the box is cheap and gives the patient a simple rule. Track returns by reason — cold-chain breach, damaged in transit, undeliverable — so the lane and packout data include what the patient experienced, not just what the carrier scanned.
The records that prove integrity
- ✓Packout specification and qualification report per configuration, with logger data
- ✓For each order: the packout used, the station and packer, the time of packout and the time of carrier pickup
- ✓Every carrier scan with time and location, retained with the order
- ✓Delivery confirmation and, where used, the temperature indicator or logger result
- ✓Excursions as deviations with the decision, the data relied on and the signature
- ✓Returns with structured reasons, and the CAPA record for any lane or packout change
Where the software carries the load
In Pharmacy Flow, packout is a field on every order — standard, cold-chain (insulated with gel packs), frozen (dry ice) or hazardous (segregated) — set from the product's storage requirement, and the cold-chain flag travels on the parcel through to the carton and the carrier record. Refrigerated and frozen materials are routed by the putaway rule to cold or frozen locations on receipt with the reason recorded. Carrier scans arrive by webhook and are stored one row per carrier event, de-duplicated on the carrier's event id, and delivery cascades to the order but honours a QA hold. Temperature excursion is a deviation category with a linked lot, severity and CAPA path; cold-chain breach is a structured return reason. Ingestion of temperature-logger data against a shipment is on the roadmap rather than in the product today; if it is a requirement for you, tell us on the demo call. The mail-order and specialty pharmacy pages cover the fulfilment floor; security and compliance covers the deviation and signature mechanics; GLP-1 pharmacy operations and the GLP-1 fulfilment page cover the product category; sterile compounding covers the <797> side; and the fulfilment automation page and automation guide cover scale. More under resources.
Frequently asked questions
How do you prove cold-chain integrity on arrival?+
With a qualified packout for the lane's duration and season, the record of which packout was used and when it was packed and collected, the carrier scans, and — where the risk justifies it — a temperature indicator or logger in the parcel. The qualification data is what turns 'it should have been fine' into evidence.
Does packout need to change by season?+
Yes. Ambient profiles differ enough between summer and winter that a configuration qualified for one can fail — or freeze the product — in the other. Qualify against both profiles and specify which configuration applies when.
What should we do when a shipment has an excursion?+
Follow a written procedure decided in advance: automatic discard for defined cases (freezing of a protein product, for example), pharmacist evaluation against stability data for others, a signed decision, and a deviation record with root cause. Repeated excursions on a lane become a CAPA.
Can we use mean kinetic temperature to accept an excursion?+
MKT is a legitimate way to evaluate cumulative thermal exposure against stability data when you have that data. It should not be used to average away a spike above a threshold at which the product is known to degrade, and it does not apply to freezing.
Which carrier service should we use?+
The one whose transit time on that lane, in that season, fits inside the qualified packout duration with margin — chosen per lane rather than as a pharmacy-wide default. Avoid weekend transit on refrigerated product unless the packout is qualified for it.
Do compounded GLP-1s have room-temperature allowances like commercial pens?+
Only if your stability data says so. Commercial labels carry the manufacturer's data; a compounded preparation has only the data behind its BUD, so treat it as refrigerated throughout unless you have commissioned excursion stability work.
Does Pharmacy Flow record temperature-logger data?+
Not today. It records the packout per order, routes refrigerated lots to cold storage, carries the cold-chain flag to the carrier record, stores every carrier scan once, and handles excursions as deviations. Logger ingestion is on the roadmap.