# Fiasp problem

**URL:** <https://forum.breakthrought1d.org/t/fiasp-problem/74108>\
**Category:** T1D Tech & Daily Management Support\
**Created:** [June 26, 2024, 3:40am UTC](https://forum.breakthrought1d.org/t/fiasp-problem/74108 "2024-06-26T03:40:38Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![garylundin](https://avatars.discourse-cdn.com/v4/letter/g/bbe5ce/32.png) [@garylundin](https://forum.breakthrought1d.org/u/garylundin)\
**Post date:** [June 26, 2024, 3:40am UTC](https://forum.breakthrought1d.org/t/fiasp-problem/74108/1 "2024-06-26T03:40:38Z")

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My doc switched me from Novolog to fiasp, I use a Medtronic pump, and it was a disaster, Never felt such anxiety, got nauseous, couldn’t eat. BS went way high, just didn’t work. Went back to Novolog and recovered.  
Anyone else have an issue?

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**Author:** ![wadawabbit](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.breakthrought1d.org/wadawabbit/32/3890_2.png) [@wadawabbit](https://forum.breakthrought1d.org/u/wadawabbit)\
**Post date:** [June 26, 2024, 7:47am UTC](https://forum.breakthrought1d.org/t/fiasp-problem/74108/2 "2024-06-26T07:47:32Z")

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Hi @garylundin . I haven’t had that issue myself but some people are in fact allergic to certain insulins.  
If your insurance ever changes to Fiasp as their preferred formulary don’t panic - you should be able to get an exemption to continue using the one that works for you. That’s not something you do yourself - your doctor must submit the request - they should know how to do it.

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**Author:** ![Dennis](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.breakthrought1d.org/dennis/32/5527_2.png) [@Dennis](https://forum.breakthrought1d.org/u/Dennis)\
**Post date:** [June 26, 2024, 2:28pm UTC](https://forum.breakthrought1d.org/t/fiasp-problem/74108/3 "2024-06-26T14:28:08Z")

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Gary @garylundin, FIASP is an ultrarapid-acting version of Aspart made with the same ingredients as its sister Aspart, rapid-acting Novolog. So, an allergic reaction is unlikely to be an issue.

I used FIASP in a MiniMed [the brand name of all pumps distributed by Medtronic] and did not have any issues owing to the fact I had created a Pattern that might hopefully allow for the very short duration of bolus before peak was reached and the overall shorter duration of the ultra-rapid formulation. I trust that, before using, you read [and didn’t assume that your doctor had read] the insert packaged with the Fiasp and looked closely at the graphs and attempted to make Pattern adjustments. Bottom line for me, I returned to Novolog where my overall management was more effective and my comfort level was improved - for me, fewer steep BGL declines.