Diabetes mellitus describes a group of metabolic disorders characterised by increased blood glucose concentration. People living with diabetes have a higher risk of morbidity and mortality than the general population and the global prevalence of diabetes in adults has been increasing rapidly over recent decades.

The use of insulin pens for the self-administration of insulin has become standard over the course of the last decade. The pens allow more simple, accurate, and convenient delivery than using a vial and syringe.

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