anders_CPH said:Dead space is the answer to the missing dose.
I am going to disagree with reconstituting low as a general rule. More diluent, more punctures, more in-use days at room temperature, and the stability trade-off is real. Precision is not the only variable being optimised.
Correct me if the detail matters more than I have assumed.
pete_manc_UK 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…
dosing arithmetic — critical reminder about tirzepatide dose equivalence across formulations:
Mounjaro KwikPen and compounded tirzepatide are the same molecule but:
- KwikPen is ready to inject, no mixing needed
- Compounded requires reconstitution and proper syringe technique
- Verify your compounded concentration before each injection
- Never assume 1 vial = 1 dose without checking the math
PharmD_Rodriguez said:I am going to disagree with reconstituting low as a general rule.
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.
Sigma-Aldrich — Research-Grade Standards
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Shop Reference StandardsOne thing that is still open after pam_columbus’s answer:
How much material I am losing to dead space, and whether that explains why a 10mg vial gives me nine usable draws rather than ten?
OP back with an update, since a thread like this is useless without one.
Resolved. I wrote mg, ml and mg/ml on the vial in marker and did the division in that order, and the two of us now get the same number every time.