The main difference between Human Actrapid 40 IU and 100 IU is the concentration: 100 IU is much stronger, containing more insulin per milliliter. Because of this, it is not safe to switch back and forth between these strengths or between vials and injection pens on your own. Doing so can easily lead to incorrect dosing, which can affect your blood sugar levels. Please always use the specific syringe or pen designed for your prescribed concentration, and consult your doctor before making any changes to keep your routine safe.
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What is the difference between Human Actrapid 40IU and 100IU, and is it safe to switch back and forth between using the vial and the injection pen?