Skyrizi can stay at room temperature for up to 24 hours without losing its stability. If it’s been out of the refrigerator longer than that, the medication may no longer be safe or effective to use. The official storage range is 36°F to 46°F (2°C to 8°C), and anything beyond a brief, controlled period outside that range puts the drug at risk of degradation.
The 24-Hour Room Temperature Window
Skyrizi is a biologic, which means it’s a large, complex protein molecule that’s sensitive to environmental conditions. According to stability data, the medication remains stable at room temperature for up to 24 hours. This is separate from the intentional warm-up period before injection, where you’re instructed to leave the carton out for 15 to 90 minutes depending on the delivery device (prefilled syringe, pen, or on-body injector).
If your Skyrizi has been sitting out for less than 24 hours, it’s generally still usable. Beyond that window, the protein can begin to break down in ways that aren’t always visible. The prescribing information does not include specific guidance on whether Skyrizi can be returned to the refrigerator after reaching room temperature, so if you’re unsure how long it’s been out, contact your pharmacist or the manufacturer before using or re-refrigerating it.
Why Temperature Matters for Biologics
Unlike a standard pill, biologics like Skyrizi are made of proteins that hold a precise three-dimensional shape. That shape is what allows the drug to bind to its target in your immune system and do its job. Heat causes proteins to unfold or clump together, a process that can reduce potency or trigger unexpected immune reactions at the injection site. Once this degradation starts, refrigerating the medication again won’t reverse it.
Freezing is equally damaging. The FDA labeling explicitly states: do not use Skyrizi if the liquid has been frozen, even if it has thawed. Ice crystals can shatter the protein’s structure in ways that make the drug both less effective and potentially harmful.
How to Tell if Skyrizi Has Gone Bad
Before every injection, you should visually inspect the liquid through the inspection window on the pen or syringe. Normal Skyrizi looks clear to slightly yellow and may contain a few tiny white or translucent particles. That’s expected.
Do not use Skyrizi if:
- The liquid looks cloudy rather than clear
- You see large particles, flakes, or clumps floating in the solution
- The color has changed beyond the normal clear-to-yellow range
- The medication was frozen at any point
Keep in mind that degradation isn’t always visible. A biologic can lose potency without any obvious change in appearance. If you know the medication sat outside its recommended temperature range for an extended period, the safest approach is to treat it as compromised even if it looks fine.
Light Exposure Is a Separate Risk
Temperature isn’t the only storage concern. Skyrizi is also light-sensitive, which is why the labeling says to keep it in the original carton. If the pen or syringe has been sitting out of its carton in direct sunlight, that’s an additional source of degradation on top of any temperature issue. UV light can break chemical bonds in the protein and in the stabilizing ingredients that keep the solution intact.
Storing and Transporting Skyrizi Safely
In your refrigerator, store Skyrizi between 36°F and 46°F. Don’t place it in the freezer compartment or against the back wall of the fridge, where temperatures can dip below freezing. Keep the carton closed to block light, and don’t shake it, as agitation can also damage the protein structure.
For travel, the manufacturer offers a free insulated travel case through the Skyrizi Complete program that keeps the medication cool for up to 8 hours. This is useful for day trips or flights, but for longer travel, you’ll need access to a refrigerator at your destination. Standard cooler bags with ice packs work too, but make sure the medication doesn’t come into direct contact with ice or frozen gel packs, since that risks accidental freezing.
What to Do if You’ve Used a Compromised Dose
If you injected Skyrizi that had been left out for an unknown or extended period, the most likely outcome is that the dose was less effective rather than dangerous. A degraded biologic primarily loses potency, meaning your symptoms may not improve as expected or could flare sooner than usual before your next scheduled dose. Protein aggregation (clumping) can occasionally cause injection site reactions like redness, swelling, or pain that’s worse than usual.
If you notice your condition worsening between doses or experience an unusual reaction after injecting, let your prescriber know what happened with the storage. They can help you determine whether you need a replacement dose or adjusted timing for your next injection.