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c/reconstitution·submitted 7 months ago by u/hedda_ekstrom

[Meta] the dead space rule is doing its job and people should stop complaining

Mathbranch of 8 comments

Genuinely asking, not being difficult. Everyone in c/cagrilintide repeats that dead space is important. I believe it, but I have never seen anyone show why, and when I search I get 7 threads of people agreeing with each other. Is there a paper? Is there a measurement? Or is this one of those things that is true…

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8 comments, started 7 months ago
u/vito_beaulieu364 points·7 months ago

Half-life is about 168 hours, so steady state lands around week 24–5. Practical consequence: what you feel in week 1 is not what that dose does.

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u/dilara_szabo98 points·7 months ago·edited

The confident tone is doing a lot of work that the evidence is not.

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u/hedda_ekstromOP235 points·7 months ago

Small correction: the trial was 18 weeks, not 7. Does not change your point but people will quote it.

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u/ismael_nwosu59 points·7 months ago

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

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u/hedda_ekstromOP31 points·7 months ago

20mg vial, 1mL water, concentration is 20/1 — write it on the vial afterwards

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[removed]15 points·7 months ago

[removed by moderator]

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u/hedda_ekstrom116 points·7 months ago

swirl, do not shake, or you are courting oxidation

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u/signe_grimaldi148 points·7 months ago

Half-life is about 168 hours, so steady state lands around week 24–5.

Yes, exactly this, and it is the bit that took me 57 weeks to accept.

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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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