Pen wastage and its effect on real cost — the long version

Posting this under the heading it deserves: Pen wastage and its effect on real cost — the long version Everything below is what sits behind that.

Documenting an access outcome, dated, because everything in this category expires.

As of January 2026, in my region, the position is as described below. I have linked the primary source rather than a summary of it, because the summaries are consistently a year behind.

If anyone can confirm or contradict this for their own region, please date your answer. An undated claim in this category is worse than no claim.

Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own records is not any individual result; it is that they are dated and consecutive.

Compute cost per delivered dose at your dose if you want a number you can act on. That requires knowing your dose, vial volume, and whether you are using a vial or a pen.