c/reconstitution · created 27 Aug 2023
Bac water, concentration math, syringe units. Show your working.
10mg vial + 2mL bac water, i want 2.5mg, how many units, and I am aware this is a minority view on this board. Hard numbers: 10mg, 2mL and 2.5mg. Anything softer than…
mg ÷ mL, that is the whole formula, why did i find this hard, which sounds obvious until you try to state the evidence for it. Started reconstituting everything to a…
your bac water is fine, your fridge door is not. That is the post. The justification is underneath. Asked SGN what volume they reconstitute to for their own stability…
foam means you shook it. do not shake it. I have gone back and forth on this for months. The lyophilised cake displaces a small volume, so the true concentration is…
Vendor-level purity averages over time, built from independent results rather than vendor claims. Transparent methodology, open dataset.
Browse resultsQuestion in the title, detail here: does needle dead space actually matter at 2.5mg doses. Numbers, in the order they matter: 2.5mg. I keep a laminated card in the…
why 1mL syringes cause overdoses and 0.3mL ones do not. If you already knew this, the post is not for you and you can scroll on. 1mL and 0.3mL. Those are measured, not…
The title is the argument: sterile water is not bacteriostatic water and it is not close. Here is the rest of it. Research-use-only material is not approved for human…
the concentration table going round is off by a factor of ten, written plainly and without the jargon that usually swallows this topic. The lyophilised cake displaces a…
Something I keep coming back to: cored the stopper on day 9. rotate your puncture site. Asked SSA what volume they reconstitute to for their own stability testing and…
Thinking out loud about this: someone check my arithmetic before i draw this up. The failure modes I have actually seen posted here, in order of frequency. One:…
Thinking out loud about this: 28 days at room temp after first puncture — where does that number come from. The numbers the title promised, since a headline without…
units are volume, mg are mass, this is the #1 error on this site. It comes up every few weeks and the answer has not changed. Aim the stream down the wall of the vial…
cloudy after reconstitution — discard, right? right. Not a hot take, just something I have not seen said plainly here. Adding more water does not change how much…
let the alcohol swab dry before you puncture, that is the step everyone skips, and I say this having got it wrong myself for long enough to be annoyed about it. The…
reconstituted at 1mL instead of 2mL and caught it before injecting. lucky. It is the sort of thing everyone half-believes and nobody writes down. The relevant figures…
Reference standards, analytical reagents and system-suitability material. If you are running your own method, start with a known.
Reference standardsAsking properly rather than in a comment on somebody else’s thread: help me understand insulin syringe, I have read the wiki twice. Shook the first vial because nobody…
someone explain units to me like I have not read a paper in years. Searched first, found three threads that contradict each other, hence the post. Adding more water…
The title is the whole question — how do you actually verify concentration — but here is why I am asking. Started reconstituting everything to a round concentration and…
someone explain bacteriostatic water to me like I have not read a paper in years. I am not trying to be the "source?" guy. I would just like a source. The lyophilised…
Question in the title, detail here: how much of what we believe about mg/mL actually comes from reconstitution threads. The arithmetic in full: concentration is mass…
Asking properly rather than in a comment on somebody else’s thread: genuine question about mg/mL that I am slightly embarrassed to ask. Aim the stream down the wall of…
help me understand mg/mL, I have read the wiki twice. I would rather ask a basic question now than get this wrong quietly for two months. Reconstituted at 3mL when I…
Posting this as a discussion rather than a claim: the bacteriostatic water thing finally clicked for me and I want to write it down. Why "more water" keeps confusing…
three years of reconstitution threads, summarised so you do not have to read them. Not a hot take, just something I have not seen said plainly here. Wrote the date on…
Asking properly rather than in a comment on somebody else’s thread: someone explain concentration to me like I have not read a paper in years. Shook the first vial…
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.
Independent HPLC and mass spec. The number you get is the number they found.
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