nope, redo it
10mg vial
+ 1.0ml -> 10.0 mg/ml 0.5mg = 5u 1mg = 10u
+ 2.0ml -> 5.0 mg/ml 0.5mg = 10u 1mg = 20u
+ 2.5ml -> 4.0 mg/ml 0.5mg = 12.5u (dont)
+ 5.0ml -> 2.0 mg/ml 0.5mg = 25u 1mg = 50u#reconstitution 2026-06-16
Tuesday46 messages7 participantstimes are UTC
Highlights from this day
- ari_arrives — if i add 0.5ml to a 15mg vial what concentration am i actually at 17:27
- cold_chain_cmdr — for the archive my rule is one concentration for everything so i never have to think about it at 7am, for what its worth 18:53
- vat_on_import — bacteriostatic water for anything multi-use. sterile water has no preservative in it at all, ymmv 19:23
- ivy_injects — slightly off topic but the powder is stuck to the stopper, do i care 21:06
- clothes_size_cass — what do you do with the last 25 units when you cant draw them cleanly 21:28
took me a year to stop over-diluting. the measurement error at 4 units is worse than the convenience
if i add 0.5ml to a 15mg vial what concentration am i actually at
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check your maths
[edited]slightly off topic but benzyl alcohol is what makes it bacteriostatic. it is about 0.9% typically
temperature of the diluent does not matter. how fast you push it in does
if you draw up with a bigger pin and inject with a fresh one you lose a bit more to dead space
thats fine
if the powder is on the stopper, tap it down before you add anything. it will still dissolve either way
update from 7 months ago: switched to a single concentration and have not miscalculated since, not advice obviously
5mg in 2ml gives 2.5mg/ml, 0.25mg is 10 units. good for a starting dose, still working it out
10mg in 2ml is 5mg/ml. so 0.5mg is 0.1ml which is 10 units on a u100
is it normal for the cake to look slightly collapsed on one side
for the archive my rule is one concentration for everything so i never have to think about it at 7am, for what its worth
do not add more bac water to an already reconstituted vial, you have lost track of the concentration
i use bac water even for a single-use vial because it stings less, which is not the reason it exists
if you cannot read the mark confidently, your volume is too small. redo it at a lower concentration
nobody here should be telling you a dose. we can check your arithmetic, thats a different thing
i write the mg/ml on the vial with a sharpie the moment i reconstitute it
follow up i have never once regretted using a rounder number and a slightly bigger volume, ymmv
bacteriostatic water for anything multi-use. sterile water has no preservative in it at all, ymmv
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a 3ml syringe for the diluent and a u100 for the dose is the setup most people here end up with
follow up gross powder mass is not net peptide. water and counterion are in that number
the meniscus thing is real. read it at eye level or you are guessing by a unit either way
aim the diluent at the glass wall, not at the powder. it goes in gentler
dead space in a standard insulin syringe hub is small but it is not nothing over a month
[edited]bac water or sterile water for something im going into weekly for 8 weeks
for the archive 30mg in 3ml is 10mg/ml, so 5mg is 50 units. half the barrel, feels like a lot but its right
if the maths gives you 13.7 units, change the volume. do not try to hit 13.7
anyone got a photo of what a properly dissolved vial looks like
write the date on
clear or bin it
read it at eye level
lyophilised powder is far more robust than people think. it is the solution that is fragile
i swirl for about thirty seconds and then leave it. never had one fail to dissolve
im getting bubbles in the barrel every single time, what am i doing wrong
one unit is 0.01ml
slightly off topic but the powder is stuck to the stopper, do i care
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give it 9 minutes at room temperature before you decide it has not dissolved
i was wrong about this last year: it is fine to draw cold, it just stings more going in, thats one data point
too dilute imo
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one unit is 0.01ml. 100 units is 1ml. everything else in this channel follows from that
my vial pulled the water in on its own, is that the vacuum or did i do something
what do you do with the last 25 units when you cant draw them cleanly
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weighing the vial before you reconstitute is the only way to catch an underfill
you can absolutely just always use 2ml, and honestly most of us should