Air bubbles in syringe — 12 month update

claudia_zurich said:

Ongoing cost tracking for dosing arithmetic — transparency for the community: Monthly medication cost: $110 Supplies (syringes, BAC water, alcohol…

Regarding dosing arithmetic multi-dose vial contamination prevention: after reconstituting, I wipe the vial stopper with a fresh alcohol swab before EVERY single draw. I also never touch the stopper with my fingers and use a new needle for each draw.

Even with bacteriostatic water preservative, contamination is cumulative. One sloppy draw can introduce bacteria that multiply over days. Aseptic technique isn't optional — it's essential for injectable medications.

B12Beth said:

The arithmetic is right and one caveat matters: a U-40 syringe changes the markings, not the volumes.

Saving this. It is the first explanation that did not require me to already understand it. I will report back once I have actually tried it.

claudia_zurich said:

Ongoing cost tracking for dosing arithmetic — transparency for the community: Monthly medication cost: $110 Supplies (syringes, BAC water, alcohol…

Reconstitution tip for anyone mixing dosing arithmetic from lyophilized powder: use bacteriostatic water, NOT sterile water. The benzyl alcohol in BAC water preserves multi-dose vials for up to 28 days.

Inject the water slowly down the side of the vial. NEVER shake — gentle swirling only until fully dissolved. Should be crystal clear with no particles.

fiona_glasgow said:

I reconstituted a 10mg vial with 2ml of bacteriostatic water and I want someone to check my unit arithmetic before I draw anything, because I keep…

Bacteriostatic water quality matters for dosing arithmetic reconstitution. Not all BAC water is created equal:

• Should contain 0.9% benzyl alcohol as preservative
• Must be sterile and pyrogen-free
• Should come in a sealed, intact vial
• Check expiration date — yes, BAC water expires
• Store at room temperature, protected from light

I buy from a reputable medical supply company, not Amazon marketplace sellers. The $3 savings isn't worth the infection risk from unverified BAC water.

Moderator note: leaving this open. It is being argued well and the disagreement is the useful part. Carry on.