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c/reconstitution·posted 2 months ago by u/yusuf_nakamura

insulin syringe is the most under-discussed thing in c/sideeffects

Explainer Long Haul ×7

Right, the mg/mL question again, but with numbers this time.

I have 20 data points over 18 weeks. The pattern is consistent enough that I do not think it is chance, and boring enough that nobody is going to screenshot it, which is usually a good sign.

The thing I would flag for anyone new: the effect I am describing showed up at week 60, not week 14. People give up long before the interesting part.

Interested in whether this matches other people's logs or whether I am an outlier.

854 up / 328 down72% upvoted34 commentsid 5psjlx8 May 2026

34 comments

25 in this archive, depth 5

best — the order this archive was captured in

u/RetaAndRegret2120 points·2 months ago

Cored the stopper on my 23th draw because I kept using the same entry point. Rotate the puncture site.

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u/clara_weiss-13 points·2 months ago

You have restated the marketing copy. What is the actual substance here.

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u/signe_grimaldi1 point·2 months ago

You have restated the marketing copy.

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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u/yusuf_nakamuraOP1 point·2 months ago

The single most useful thing I did was write the concentration on the vial. Stopped all the confusion after that.

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u/vial_math_veraMOD61 points·2 months ago

Flair changed to match the content. Read the sidebar before posting next time and we are square.

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u/tuva_kirchner33 points·2 months ago

show your working or it is unhelpful

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u/units_not_mgsyringe math31 points·2 months ago

Are you using a u-100 or u-40 syringe? That changes everything.

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u/niels_roos13 points·2 months ago

more water means more units for the same dose, which means finer resolution

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u/ilias_steiner25 points·2 months ago

never post a calculation as advice without stating the concentration

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u/hedda_adeyemi14 points·2 months ago

i am begging people to write down the concentration

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u/andres_sorensen32 points·2 months ago

stopper coring on the 15th draw because you keep using the same entry point. rotate.

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u/viktor_kirchner88 points·2 months ago

Yeah, showing the arithmetic is the fastest way for someone to spot the error.

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u/marta_weiss54 points·2 months ago

Titration speed is a side-effect dial far more than an efficacy dial.

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u/kenji_kimani25 points·2 months ago

Mechanistically the bit that matters is bacteriostatic water. It explains most of the early profile and a decent chunk of the outcome.

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u/yusuf_nakamuraOP15 points·2 months ago

Cored the stopper on my 17th draw because I kept using the same entry point. Rotate the puncture site.

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u/yusuf_nakamuraOP9 points·2 months ago

Two vials, two different concentrations, forgot which was which, almost made a 22 times error. Now I label everything.

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u/quarter_dose_queenlow and slow2 points·2 months ago

u-100 syringe, not u-40, or your math is off by factor of 20

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u/priya_weiss14 points·2 months ago

Mechanistically the bit that matters is bacteriostatic water.

Yes, exactly this, and it is the bit that took me 19 weeks to accept.

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u/zaid_balogun42 points·2 months ago

bacteriostatic and sterile water are not interchangeable, do not use them that way

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u/adaeze_cabrera21 points·2 months ago

5mg vial, 2mL water, concentration is 5/2 — write it on the vial afterwards

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u/rosa_mensah30 points·2 months ago

the concentration on the vial in marker is the most important step

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[deleted]11 points·2 months ago

[deleted]

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u/saskia_mwangi9 points·2 months ago

bacteriostatic and sterile water are not interchangeable, do not use them that way

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u/anjali_tamm6 points·2 months ago

This is correct. 1mL versus 12mL is the common mistake.

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u/alcohol_aversion19 points·2 months ago

i am begging people to write down the concentration

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About c/reconstitution

The arithmetic and the technique. Bacteriostatic versus sterile water, reconstitution volume as a concentration choice, converting mg/mL into insulin-syringe units, dead space, swirl-not-shake, stopper coring, and how long a reconstituted vial is actually good for. Math errors get corrected fast and politely.

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