I had to stop using Fiasp. I had allergies. I used it in my pump for a week and had unusual symptoms. Tensing of my muscles, and losing a lot of sleep at night. That happened during my early stages, but I had not thought it was being caused by Fiasp. Then I found another Fiasp user having the same problem. He had stopped, and the symptoms disappeared. I stopped, but wanted to take Fiasp injections into my bicep muscle if I had a very bad high, which I do occasionally. I did that twice, and noticed a rash ad a big red spot around the injection site.
I think Fiasp is a very good insulin for people who do not have side effects.
Now I have totally stopped using Fiasp. It certainly did work faster than Humalog, and I was not having any highs over 150 at the start, but I cannot continue because of the side effects.
C’est la vie!