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c/reconstitution·submitted 6 months ago by u/honest_syringe_2025

4 months in and dead space is still the thing I get wrong

PSAbranch of 7 comments

Posting this because I searched for it and got nothing useful. Setup: 5mg, week 19, constipation present but not ruining anything. I changed exactly one variable — units — and tracked it for 21 weeks. Result: a difference, but a small one, and well inside what I would call noise if someone else posted it. So I am…

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7 comments, started 6 months ago
u/vial_math_veraMOD283 points·6 months ago

This is an urgent-care question wearing a forum question's clothes. Please contact a clinician rather than waiting for replies.

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u/batch_number_bertievetting86 points·6 months ago·edited

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

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u/priya_weiss56 points·6 months ago

never post a calculation as advice without stating the concentration

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u/elodie_grimaldi43 points·6 months ago

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

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u/escrow_evangelist30 points·6 months ago

swirl, do not shake, or you are courting oxidation

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u/piotr_bruun7 points·6 months ago

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

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u/britta_nakamura23 points·6 months ago

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

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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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