Yes. Fiasp is a rapid-acting insulin that can be adjusted according to the amount of carbohydrates consumed before meals. This method is commonly called carbohydrate counting and helps control post-meal blood glucose levels more accurately. The dose is usually calculated using an individual insulin-to-carbohydrate ratio and may also include correction doses based on current blood glucose levels. Since insulin requirements vary from person to person, dose calculations should only be determined and adjusted under the guidance of a diabetologist or healthcare professional to reduce the risk of hypoglycaemia or hyperglycaemia.

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.