My take from using Fiasp®
Dr. Matthew Stephen is one my endocrine practice partners. Matt has lived well with type 1 diabetes for 33 years. He has used Fiasp and wrote this summary of his thoughts.
Not surprisingly, the Fiasp® FlexTouch pen looks and feels much like the Tresiba® FlexTouch.
In my limited experience so far with Fiasp, I have appreciated its rapid absorption and action. Pre-meal dosing should be done with caution especially if pre-meal glucose is low or low-normal as it is absorbed and acts noticeably more rapid than other bolus insulins.
I am not in the habit of eating a lot of simple carbohydrate meals or snacks; however, I did find it helpful in staying ahead of glucose rises with both cereal and donut intake.