Now that Fiasp has been cleared for Omnipod, is it a game changer?

Please let me know if your experiences with Fiasp have been positive and whether I should consider switching from Humalog in my Omnipod system. Fast acting sure sounds good, but is it all hype?


I dunno, but some people claim that this is changing systems to be more closed loop - like the system automation can respond fast enough with fast acting insulin to make you not need to bolus for meals. I dunno

“Gamechanger,” I dunno, but I’ve been pumping with it for over a year and I prefer it. Mainly switched to it because onset of Novolog/Humalog was really slow for me, especially on stressful workdays, when I might be waiting an hour or more to see a bend in my CGM so I could finally eat lunch. Drove me nuts. Fiasp has gotten it to be a very reliable 20-30 minutes irrespective of external circumstances, and that makes life a lot easier. I also had problems with AIT, that the other insulins tailed off very inconsistently, making it hard to avoid exercise-induced hypos on my homeward bike commute even when I set a temp-basal to zero an hour ahead of time. I now find those temp basals much more predictably effective. It just seems like the “edges” are a lot sharper all around. There are some things you have to watch out for, particularly with high-fat meals: I’ve had boluses come on way too soon when eating pizza, e.g. And it changes how I think about dual wave bolusing. But the greater precision in how it behaves has been noticeable and consistent and makes things easier to plan out.

As for looping, I would think all of those attributes would make it perform really well in that situation. I’ve heard that’s true with 670G pumpers who are using it, and I did consider maybe giving my 670 another try with it, but I really hate the Medtronic CGM system, so haven’t pursued that.


I was on Novolog, then switched to Fiasp. All on my Tandem X2 pump.
I had really good results.
Because I buy Fiasp out of pocket, I stopped using it for a while and went back to Novolog.
This was the eye opener for me! Even though the initial super fast reacting period wore off, it ends up being a LOT better for me to use Fiasp than Novolog.
I didn’t realize how good it was for me until I went back to Novolog.
It wasn’t just the quicker reaction time, it was all the lows the Novolog was causing me. I had to keep my BG higher than I wanted with Novolog than I could with Fiasp.
Novolog would drop me like a freight train out of control, whereas Fiasp is a lot easier to stop/slow a fast drop.
Actually, with Basal-IQ, and my basal set right, most of the time Basal-IQ could take away my future basal to slow/stop almost all my dropping BGs!


I’ve been pumping FiASP for 7 months and won’t be returning to Humalog ever (the 2 vials of Humalog in fridge are likely never going to be used).

Faster onset and far more predictable durations and tails. Did I mention I don’t have to guess about the trailing Humalog tail that always was so random in nature … ?

Staying in range is much easier for me with FiASP.


Hmmm, I turned down the offer of a Fiasp prescription because “on the books” it was faster but it still had the tail. It looks like I will have to rethink that! Of course after I just got my shipment of 3 months of humalog in! But I am going to go for Afrezza with the humalog.


On my pump, I have Novolog set with IOB of 5 hours.
I have Fiasp IOB set for 3:30 hours.
I can actually use 3 hours for Fiasp, but once in a while I have an issue, so I erred on the side of safety.


Yes, it looks that way in the published graphs, but that’s not what I experience. I’d echo what @Jimi63 just said:

I used to keep my Time of Insulin Action set at 4 hrs, pretty generous and more or less right if not exercising. But if I bolused at noon and started my homeward bike commute at 5, suddenly I discovered I had plenty of IOB and could end up in the 50s by the time I got home. I tried zeroing out my basal an hour before leaving but still ran into problems because it was like somehow the stuff was lingering somewhere. This is no longer such a problem.

I think that’s one thing that doesn’t get mentioned enough in Fiasp discussions: that it makes temp basals much more precise and effective because of the sharper on/off. That’s why I think it would be great in a looping system where the continuously-adjusting basal blips would be more precise to what the system is expecting of them. The speed thing is good, but more than that it’s the precision.


To restate with a little more data.
With Basal-IQ, I lowered my A1c, while using Fiasp, from 5.8 to 5.2
When I changed back to Novolog, I could NOT keep my same profiles to keep the Basal-IQ running so efficiently. I do not have a current A1c, but I know my numbers are higher because of it!


Hi there Jim2,
I tried to use Fiasp for quite some time but I found it just wouldn’t work for me. I also take 5 units of Tresiba every morning. I am using Humalog to manage any spikes, usually 2 units every morning. I eat low carb so I am sure that helps.
With Fiasp, I would take 4 units when my blood sugar was at 14.5 and my blood sugar would just not budge. I tried 6 units once and it brought my sugar down to 11.5. So for some reason it just didn’t work in my system.
With Humalog I would take 1.5 units and it would bring my sugar down to 5.5.
It’s really quite a drag cause I would love to not have to wait 45 minutes for the Humalog to kick in. Anyone else experience this with Fiasp? Thanks!

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