I recently got a Novopen 5 since my Tresiba prefilled pens are running out. The Novopen 5 instructions repeatedly emphasize that the pen was designed for use with 3ml Novo Nordisk Penfill cartridges … and with NovoFine or NovoTwist needles.
I don’t have such needles. Instead, I have mylife Penfine Classic 6mm ones. I now wonder if the type/brand of needle affect anything. I know that the length can influence things, as can the thickness/gauge, but other than that, does it matter? Or is this simply a legal matter, because Novo Nordisk tested the pen with their needles only and thus cannot legally guarantee function with others?