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c/reconstitution·posted 3 days ago by u/cesar_ivaturi

mg ÷ mL, that is the whole formula, why did i find this hard

Discussion Cold Box ×1 Long Haul ×2

Something I noticed reading old threads that I have not seen said out loud.

The advice on units in this community changed substantially around the start of last year, and nobody went back and updated the older posts. So depending on which thread the search engine hands you, you get two contradictory answers with the same confidence.

I have listed what I think the current consensus is below. Correct me — that is the point of posting it.

1,179 up / 126 down90% upvoted30 commentsid l5l5f126 Jul 2026

30 comments

26 in this archive, depth 5

best — the order this archive was captured in

u/yusuf_nakamura-7 points·2 days ago
four days. it took four days for me.
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[deleted]1 point·2 days ago

[deleted]

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u/RetaAndRegret21 point·2 days ago

swirl, do not shake, or you are courting oxidation

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u/emil_okwuosa1 point·2 days ago

This is correct. 1mL versus 8mL is the common mistake.

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u/rasmus_mensah96 points·2 days ago

Did you write the concentration on the vial?

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u/india_generic_g40 points·1 days ago

swirl, do not shake, or you are courting oxidation

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u/swirl_dont_shakeMOD43 points·2 days ago

Tracking number removed. It identifies both ends of a shipment.

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u/freya_onwuka34 points·1 days ago·edited

i am begging people to write down the concentration

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u/cesar_ivaturiOP14 points·1 days ago

Dead space ate 15 units on a low-volume draw. Tiny impact at 12.5mg, massive impact at 15mg.

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u/georgi_adebayo51 points·3 days ago

Cosigning. The concentration on the vial in marker is load-bearing.

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u/cesar_ivaturiOP20 points·2 days ago

Disagree. What you are describing is consistent with mg/mL, not with what you concluded.

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u/ruben_cabrera16 points·2 days ago·edited

Disagree.

Adding to this: concentration is doing more work than the comment implies.

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u/erez_perrin4 points·2 days ago

show your working or it is unhelpful

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u/hub_opssite staff3 points·1 days ago

This is correct. 2mL versus 9mL is the common mistake.

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u/honest_syringe_maybe25 points·2 days ago

stopper coring on the 6th draw because you keep using the same entry point. rotate.

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u/honest_syringe_202515 points·2 days ago

This is correct. 2mL versus 21mL is the common mistake.

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u/elin_ferrari22 points·1 days ago

i am begging people to write down the concentration

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u/sigrid_kaufmann17 points·2 days ago

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

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u/cesar_ivaturiOP7 points·2 days ago

This is correct. 3mL versus 4mL is the common mistake.

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u/ismael_nwosu29 points·2 days ago

Is that 15mg vial or 4mg?

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u/andres_sorensen40 points·1 days ago

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

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u/mateusz_achebe17 points·1 days ago

u-100 syringe, not u-40, or your math is off by factor of 19

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u/britta_nakamura6 points·1 days ago

Not convinced. The evidence does not support that reading.

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u/kavya_radich5 points·23 hr ago·edited

i am begging people to write down the concentration

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u/adaeze_cabrera21 points·1 days ago

Spent 23 weeks confused about concentration math until someone showed me the table. 5mg, 2mL, concentration is 5/2.

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u/nabila_espinoza14 points·1 days ago

swirl, do not shake, or you are courting oxidation

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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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