If you’ve ever found an old CGM patch in your drawer, you’ve probably wondered: Does the expiry date really matter? After all, it’s just a bit of fabric and adhesive... right?
Let’s unpack what those expiry dates actually mean, whether they affect how well your patch works, and how to store your CGM patches properly so you’re not left second-guessing. Spoiler: this isn’t about fear or waste - it’s about staying comfortable, confident, and sensor-secure.
What does ‘expiry’ actually mean for a CGM patch?
Unlike medications, CGM patches don’t “go off” in a way that’s dangerous or visible. But expiry dates still serve a purpose. Over time, the adhesive used in patches can break down or dry out, making them less effective at:
- Sticking securely to your skin
- Flexing with your movement
- Minimising skin irritation
That doesn’t mean a patch instantly becomes useless the day after expiry - but it does mean it might not perform at its best. Adhesive degradation is a slow, quiet process, and it’s often not noticeable until your patch starts peeling off too early or causing discomfort.
This is why brands like Type Strong put shelf life front and centre - because performance matters, especially when you’re wearing your sensor for days at a time. Using high-quality device-specific patches helps ensure more consistent wear across your routine.
Signs a patch might be past its prime
If you're wondering whether an older patch is still okay to use, here are a few signs it might be better left in the bin:
- The adhesive feels dry, stiff, or oddly flaky
- It doesn’t stick well on clean, properly prepped skin
- The patch curls or lifts quickly after applying
- You experience CGM patch reactions like itching, redness, or bumps
- The packaging looks warped, faded, or has been exposed to heat or humidity
Tip: If you're applying an older patch, try it during a calm day at home – not before sport, sleep, or long outings.
How to store CGM patches to extend their shelf life
Adhesives are sensitive to air, moisture, and temperature - and CGM patches are no exception. To keep yours fresh for as long as possible:
- Store them in a cool, dry place (not your bathroom or glove box)
- Avoid direct sunlight, humidity, or fluctuating temps
- Keep them sealed in their original packaging until you're ready to use
- Don’t mix open and unopened packs in the same container
Type Strong’s product bundle is a smart way to stay stocked while keeping each patch individually sealed. Whether you're using Dexcom G7 patches, Freestyle Libre patches, or Medtronic patches, long-term performance starts with good storage.
And if you’re the active type? Look for waterproof, sweatproof options that are built for heat, movement, and weather fluctuations.
Should you ever use a patch past its expiry date?
The short answer? Maybe - but it depends.
If the patch is just slightly past its expiry date, still sealed, and has been stored well, there’s a decent chance it’ll still work. Some people find that older patches are fine in a pinch - but others notice reduced hold time or discomfort.
Here’s when you should definitely be cautious:
- The patch is months or years out of date
- It’s been exposed to heat, moisture, or light
- The adhesive feels off (dry, sticky in a weird way, etc.)
- You have sensitive skin or a history of skin irritation from patches
If you’re relying on your patch to stay put during a workout or sleep cycle, consider using skin adhesive wipes for extra security – or layering a second patch if needed.
Curious about layering? Here’s what happens when you stack CGM patches.
Final takeaway – expiry dates are about performance, not panic
Patch expiry dates aren’t there to scare you or create waste. They’re there to help you get the most reliable wear, the strongest hold, and the least chance of irritation.
If you wear CGMs regularly, staying stocked with spare CGM patches and storing them properly gives you peace of mind. You’ll always have a fresh patch ready - no guesswork needed.
To simplify your stash, try a Type Strong patch bundle. It’s an easy way to keep your favourites on hand, from Omnipod patches to Dexcom G6 patches. And if you’re buying in bulk, here’s how to do it right: the bundle advantage.