I have been using Fiasp for a couple of years with my insulin pump.
It has its quirks but now I understand them, I am happy with it.
- It does not last as long out of the fridge as other insulins. It seems to be ok for a couple of weeks but if you are on a small dose, this could be a problem.
- The speed at which is starts working for me, seems to be dependent on my current levels. If my blood sugars are in the 4s and 5s, it starts almost instantly. If my levels are in double figures, it can take an hour to see any movement. This means I need to consider my levels when deciding when to pre-bolus.
- Some people find that it stings when injected. Thankfully, I do not experience this.
Overall, it is faster and better than NovoRapid which I was on and Humalog which I tried for about a week.