When Your CGM Refill Goes Sideways (And What to do Next)
I’ve used a Dexcom CGM for years without drama. Lately, though, pharmacy runs have been a drag. My usual location closed, so I had to transfer to a farther one and it hasn’t been great: long lines and endless hold times whenever I have questions. Not ideal, but manageable…until my latest refill.
In between work meetings, I had just enough time to run through the drive-thru. After waiting far too long in line, I quickly paid, grabbed my bag, and drove off. But as I set it on the passenger seat, I noticed it felt way too light. I pulled over: only three sensors. I normally get nine. With no time to go back, I assumed the pharmacy had messed up.
Later, when I finally called, the pharmacist explained my doctor had renewed it as a 30-day supply instead of 90. Annoying, but I had an endocrinology appointment the next week, so I flagged it there. They assured me it was fixed.
The Saga Continued
By now I was anxious. I had only one sensor left and I travel a lot for work. I’ve had sensors fail on me before, and even backups fail too. Only having one left was a huge worry.
I called my doctor’s office and left a detailed message. Thankfully, they called back quickly and explained they’d already sent the pharmacy two prescriptions:
- A 30-day supply I could pick up immediately to cover the shortfall, and
- A separate 90-day supply to reset my usual rhythm going forward. Unfortunately, for some unknown reason, the pharmacy still claimed they didn’t recieve the 30-day script from my doctor. Sigh…
- It shouldn’t be this hard. But, this is the kind of frustrating mess people with Type 1 run into from time to time. If you find yourself in this maze, here are some steps that might save you the same headaches.
If This Happens To You
1) Before you leave the counter (when you can):
Check the label for days’ supply (30 vs 90) and quantity (e.g., 9 sensors).
Glance at the receipt: does it match what you usually get?
Call your doctor’s office first. Ask how the script was written (quantity + days’ supply + refills).
Ask the pharmacy to read what’s on file. Are there two active scripts (e.g., a one-time 30-day plus a 90-day)? Which one are they trying to bill?
If insurance is blocking the 90-day, ask the pharmacy to run the 30-day (or request your doctor send a separate 30-day “bridge” prescription).
3) Try this mini-script (saves breath and sanity):
“I was shorted due to a 30-day script. My doctor says they sent two prescriptions: a 30-day to pick up now and a 90-day for future fills. Can you check if both are on file and run the 30-day today to cover the shortfall?”
4) If you’re getting the runaround:
Ask for the pharmacist-in-charge or the store manager.
Call your doctor’s office and ask them to call the pharmacy directly while you’re on the line or same day.
Document who you spoke with and when—it speeds up follow-ups.
For next time (lessons learned):
At your endo visit, confirm your Rx is written for 90 days with the correct quantity and refills.
Ask your clinic to include a bridge plan note (“If 90-day blocked by insurance timing, permit one 30-day interim fill”).
Keep a two-sensor buffer if possible, so surprises don’t put you at risk.
Before pickup day, use the app or call to confirm which prescription they’re filling.
Why This Keeps Happening
Clinics sometimes “fix” an error by sending a new script but don’t cancel the old one.
Pharmacy systems can default to the wrong active script and often the one that fails insurance timing.
Insurance timing rules are rigid; a pharmacist can’t override them, but they can run the correct script (e.g., the 30-day bridge) if it exists.
Bottom Line
You can do everything right and still get stuck. That’s not on you. The fastest path through is usually: doctor clarifies the Rx → pharmacy runs the bridge → future 90-day resets your rhythm.
If you’ve been through this, share what finally worked for you. It just might help the next person in line, maybe literally.
Want More Practical Tips?
I’m Alyssa
I’ve been living with type 1 diabetes since 2009, and I’m navigating the complexities of midlife right alongside you; hormonal changes, energy fluctuations, and everything in between. I created MidlifeT1D to share what truly helps me manage the highs and lows, ensuring you don’t feel like you’re facing this journey alone.
Thank you for being here. I’m grateful that we tackle can this together.
