Yes, but only if your Tresiba® is supplied in 3 mL Penfill® cartridges, since NovoPen® 4 is designed for Penfill. If your Tresiba® comes as a FlexTouch® prefilled disposable pen, it cannot be used with NovoPen 4 because FlexTouch is single-use and the insulin cannot be transferred. Always check the packaging: “Tresiba Penfill” is compatible, while “FlexTouch” is not.

Yes, you can use the NovoPen 4 with NovoMix 30 insulin, provided the insulin is in a PenFill 3 mL cartridge format. The NovoPen 4 is designed to work with PenFill cartridges and is compatible with NovoMix 30 when it is in this cartridge format. Always consult your healthcare provider to ensure you're using the correct dosage and technique for your specific needs.

Although Tresiba, Fiasp, and the NovoPen 4 are all manufactured by Novo Nordisk, they are not designed to be interchangeable. Each insulin pen is designed to work exclusively with its matching insulin cartridge, regardless of whether they are from the same company. This design is a critical safety feature to prevent medication errors, which can lead to dangerously high or low blood sugar. Always use the specific pen designed for your insulin product and consult your doctor if you are ever unsure.