Storage & handling

Two products, two stability profiles

A lyophilized vial and the solution made from it are, for storage purposes, different products. Water is the medium in which most degradation chemistry happens — hydrolysis, oxidation, aggregation. Removing it slows all of that down by orders of magnitude, which is why dry preparations are routinely assigned shelf lives measured in months or years while the reconstituted solution is measured in days or weeks.

The practical consequence: do not carry a storage assumption across the reconstitution step. The expiry printed on an unopened vial describes the dry powder under the specified conditions. Once fluid is added, that date is superseded by the beyond-use date assigned to the solution.

Temperature

Before reconstitution

Lyophilized product is typically stored either refrigerated at 2–8 °C or at controlled room temperature, depending entirely on the formulation. Some preparations tolerate short excursions to room temperature well; others do not. The label states which regime applies — it is not something to infer from the physical appearance of the cake.

After reconstitution

Reconstituted solutions are usually refrigerated at 2–8 °C. Refrigeration slows chemical degradation and, for preserved multi-dose vials, adds a second barrier alongside the preservative. Store the vial in the body of the refrigerator rather than the door, where temperature swings with every opening, and away from the back wall or cooling element where localised freezing occurs.

Monitor the refrigerator rather than trusting it. A calibrated thermometer with a logged minimum and maximum, checked on a schedule, is the difference between knowing your storage held and assuming it did.

Light

Photodegradation is real for many molecules, and the exposure that matters is cumulative rather than momentary. Where a preparation is light-sensitive, the label or packaging will say so — amber vials, foil overwraps, and opaque cartons all exist for this reason.

Practically: keep vials in their original carton, keep the carton closed, and do not stage product on a windowsill or under a bench lamp while you work. Brief handling under normal room light is expected and accounted for; leaving a vial out on a counter for a shift is not.

Orientation and physical handling

Storing vials upright keeps the solution off the stopper. Prolonged contact between fluid and rubber increases the chance of leachables entering the solution and can affect stopper integrity over time. Upright storage also makes visual inspection easier, since particulates settle where you can see them.

Beyond that, handle gently. Agitation from transport, dropping, or being rattled loose in a drawer stresses the solution in the same way shaking does during reconstitution. Keep vials secured and cushioned, and inspect any vial that has taken a knock before using it.

Beyond-use dating

A beyond-use date (BUD) is not an expiry date and the distinction matters. An expiry date comes from the manufacturer's stability testing on a product in its original, unopened container. A BUD is assigned by the compounding pharmacy to a preparation it has made or altered, and it reflects both chemical stability and the microbiological risk introduced by the compounding process itself.

BUDs are governed by the USP compounding chapters — notably USP <797> for sterile preparations — and depend on the category of compounding, the environment it was performed in, and whether supporting sterility and stability data exist. This is why two superficially similar preparations from different pharmacies can carry different dates: they were prepared under different conditions.

The BUD assumes the storage conditions on the label were maintained continuously. A preparation that spent an unknown interval at room temperature no longer has a meaningful BUD, whatever the printed date says. Record the reconstitution date and diluent volume on every vial so the date is traceable to something — the reconstitution guide lists the full labeling set.

Cold chain on receipt

The shipment is the least controlled part of the chain, so inspect it as it arrives rather than after it has been put away.

• Open temperature-controlled shipments promptly. A validated shipper only holds temperature for a defined window, and that window is often nearly spent on arrival.
• Check the coolant. Fully melted gel packs or a warm interior suggest the shipment ran out of thermal protection before it reached you.
• Read any temperature indicator or data logger included in the package and record the result before discarding the packaging.
• Inspect the vials themselves for cracks, compromised seals, leakage, or anything frozen solid that should not be.
• Reconcile the contents against the packing list and confirm identity, strength, quantity, and expiry.
• Move product into the correct storage immediately, and log receipt: date, time, condition on arrival, and who checked it.

If anything about the shipment looks wrong, quarantine it rather than shelving it — clearly separated and labeled not for use — and contact the dispensing pharmacy. A quarantined vial can be released later; a vial that has already been mixed into working stock cannot be untangled.

When to discard

Take a preparation out of service if any of the following applies. These are screening criteria, not a substitute for your own institutional policy.

• Cloudiness or haze in a solution the label describes as clear.
• Visible particulates — fibres, crystals, flakes, or rubber fragments from coring.
• Discolouration, or any colour change from the appearance described on the label.
• Incomplete dissolution that persists after reasonable gentle mixing.
• The beyond-use date has passed, regardless of how the solution looks.
• A storage excursion — the vial was frozen, left out, or held outside its range for an unknown period.
• Container compromise — cracked glass, a damaged or lifted stopper, evidence of leakage.
• Missing or illegible labeling, including an unknown reconstitution date or diluent volume.
• Any doubt about sterility, such as a suspected touch contamination of the stopper or needle.

Dispose of discarded preparations and sharps according to your facility's waste procedures and applicable regulation. Document what was discarded and why; that record is what turns a discard into a traceable quality event rather than an unexplained inventory gap.