Topic summary

Revisiting: Drawing up with one needle and injecting with another

Practice › Administration subcutaneous injection injection site reaction needle gauge & length missed dose aseptic technique

This is a generated summary. It shows the 9 most-liked posts from a topic of 84, 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.

f.rasmussenTL230 Mar 2026#1

Revisiting: Drawing up with one needle and injecting with another Writing it up because I had to work it out twice and would rather nobody else did.

A practical question that I suspect has a boring answer, which is why I could not find it discussed.

The maintained page covers the general case well. My case is one step off it, and the step looks small enough that it probably does not matter — which is exactly the reasoning that has caught me out before.

What I would like is somebody to tell me whether the step is genuinely small or whether it only looks that way.

40 likes 4mo

se.okaforTL231 Mar 2026#5

Answering the question the opening post raises rather than the one it answers.

A site rotation scheme that actually works: abdomen, outer thigh, back of arm, outer hip. Rotate through them in order, move a minimum 2 cm between consecutive sites, note the site with each dose. If a local reaction appears you have the history. If you rotate properly you will not get lipohypertrophy from overuse of one area.

29 likes 4mo

impurity_tableTL3Analytical chemist1 Apr 2026#12

Post #8 put the caveat in the right place and I want to underline it.

Injecting slowly is worth doing for volume rather than for chemistry. Larger volumes delivered quickly are the ones people report as uncomfortable.

The short version is the first sentence; the rest is why.

30 likes 4mo

c.dahlbergTL22 Apr 2026#19

If you have to inject at a different time of day than usual, that is a much smaller perturbation than it feels for a weekly compound with a week-long half-life.

29 likes 4mo

p.fontaineTL23 Apr 2026#28

Useful. I had the fact and not the reason, which turns out to be the important half.

29 likes 4mo

n.ibarraTL24 Apr 2026#34

Injecting into an area that has become firm: lipohypertrophy — thickened fatty tissue from repeated injection in one area — changes local tissue absorption. Avoid injecting into areas that are noticeably firm or lumpy and allow those areas to recover for at least a few months.

One case, stated as one case.

32 likes 4mo

a.adeyemiTL24 Apr 2026#43

I had read the opposite somewhere and cannot now find where, which tells me something.

27 likes 4mo

a.ibarraTL25 Apr 2026#51

s.oyelaran, post #30: Injection discomfort: comes from needle gauge (finer = less discomfort), volume (smaller = less discomfort), temperature (room temperature or warmed is less uncomfortable than cold), and technique (smooth, purposeful injection is less uncomfortable than hesitant). All four are under your control. Go to post

Appreciated. The plain phrasing does more work here than a longer post would.

27 likes in reply to #30 4mo

h.bhattacharyaTL26 Apr 2026#62

i.norgaard, post #11: Building on post #10 rather than restating it. A new needle for each injection is not fussiness. A needle blunts on first use and a blunted needle is the reason the second injection hurts more than the first. Posted with less confidence than the sentence structure implies. Go to post

Post #61 is right about the mechanism and I think understates the practical bit.

Bleeding at the site is common and unremarkable at these needle gauges. Persistent bruising in the same area repeatedly is worth a change of technique or of site rather than of compound.

Reading it back, the second half matters more than the first.

33 likes in reply to #11 4mo

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Injecting into an area that has become firm: why not to — does this still hold?Practice › Administration · 2 replies

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