Topic summary

A pen that felt like it delivered nothing: diagnosing it afterwards

Devices › Pens & autoinjectors storage subcutaneous injection missed dose dead volume Solved

This is a generated summary. It shows the 6 most-liked posts from a topic of 40, in their original order, with the accepted answer included where one exists. It is a reading aid and it will miss nuance — the full topic is the record.

ro.friskTL2 Moderator19 May 2025#4

Priming: most pens require priming before the first use (injecting a small amount to fill the needle and line). Not priming can result in no dose being delivered on the first injection.

21 likes 14mo

orbitrap_olaTL3Mass spectrometrist Solution29 May 2025#5

Reusability: some pens are single-use (throw away after one injection). Others can be reused until empty. Confirm which type you have. Reusing a single-use pen is ineffective because the mechanism does not reset.

7 likes 14mo

b.jankowiakTL3Regular3 Jul 2025#9

PharmNotes_Whitfield, post #7: Needle installation: some pens require a fresh needle for each injection; others have a single needle that stays attached. Check the design of your pen. Go to post

Picking up post #6: that is the part I would want checked first.

Dose counters: pens show the remaining number of doses. When the counter reaches zero, the pen is empty and cannot deliver more. Noting the counter before injection prevents running out unexpectedly.

30 likes in reply to #7 13mo

trough_indexTL3Regular16 Nov 2025#28

a.zamora, post #1: On the subject in the title: A pen that felt like it delivered nothing: diagnosing it afterwards Working notes rather than a conclusion. A question about technique rather than about dose. I have been doing the same thing for 14 months and it works, and then I read one of the documentation pages here and realised I may have been… Go to post

Coming back to post #26, because the follow-up matters more than the original answer.

Pen mechanics: most pens are dial-and-inject devices where you dial the dose on the pen and push the button to inject. Understanding your specific pen's mechanism prevents dose errors.

24 likes in reply to #1 8mo

id.almeidaTL2 Moderator11 Dec 2025#32

trough_index, post #28: Coming back to post #26, because the follow-up matters more than the original answer. Pen mechanics: most pens are dial-and-inject devices where you dial the dose on the pen and push the button to inject. Understanding your specific pen's mechanism prevents dose errors. Go to post

I disagree with the reply above, and I think the disagreement is substantive rather than terminological.

The distinction being drawn does not survive when you look at the published data for this specific question. I would be glad to be shown wrong on this, because the version I am arguing against is more convenient.

31 likes in reply to #28 8mo

c.tullochTL2 Moderator4 Jan 2026#36

d.oyelaran, post #35: Visibility of the dose: some pens allow you to see the insulin remaining; others do not. Keeping track using the dose counter is important if visibility is limited. Go to post

Needle installation: some pens require a fresh needle for each injection; others have a single needle that stays attached. Check the design of your pen.

23 likes in reply to #35 7mo

Read the full topic (40 posts)

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