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ForumsCompounding & FormulationNeedle gauge and dead space — March 2026 Page 5

Needle gauge and dead space — March 2026

TirzTom Wed, Jun 4, 2025 at 6:46 PM 49 replies 2,557 viewsPage 5 of 10
LabKate
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Jun 9, 2025 at 2:01 PM#21
maya_sedona said:
Regarding dosing arithmetic multi-dose vial contamination prevention: after reconstituting, I wipe the vial stopper with a fresh alcohol swab before…

This is my experience too, for whatever a second data point is worth. Posting only so the count is not one.

23 23JenMemphis, pat_auckland, Dr.GastroMayo and 20 others
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carlos_SATX
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San Antonio, TX
Jun 10, 2025 at 10:09 PM#22
maya_sedona said:
Regarding dosing arithmetic multi-dose vial contamination prevention: after reconstituting, I wipe the vial stopper with a fresh alcohol swab before…

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
22 22FranDenver, Dr.BariatricHTX, LindaRN_retired and 19 others
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Dr.PulmRoch
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Jun 12, 2025 at 6:18 AM#23
maya_sedona said:
Regarding dosing arithmetic multi-dose vial contamination prevention: after reconstituting, I wipe the vial stopper with a fresh alcohol swab before…

Comparison of compounded dosing arithmetic delivery formats I've tried:

FormatProsCons
Lyophilized vialLongest shelf life, lowest costRequires reconstitution
Pre-mixed vialReady to draw upShorter shelf life (28-45 days)
Pre-filled syringesMost convenientHigher cost, shorter shelf life
Sublingual dropsNo needlesLower bioavailability, less data

I use lyophilized vials for cost and stability. The reconstitution takes 30 seconds once you've done it a few times.

21 21AttorneyGrant, DebRD_ATL, KristenIndy and 18 others
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Dr.RaviCardio
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Jun 13, 2025 at 2:28 PM#24

A narrower follow-up, since the general answer is now clear:

What did you change at the same time, and can you separate the two now?

Last edited: Jun 13, 2025 at 3:28 PM
20 20hans_munich, jason_sac26, chris_chi24 and 17 others
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KristenIndy
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Jun 14, 2025 at 10:38 PM#25
Dr.PulmRoch said:
Comparison of compounded dosing arithmetic delivery formats I've tried: Format Pros Cons Lyophilized vial Longest shelf life, lowest cost Requires…

For anyone reconstituting dosing arithmetic peptides: the water-to-powder ratio determines your concentration. Here's my reference:

Vial SizeBAC WaterConcentration0.25mg Dose
5mg2mL2.5mg/mL10 units
5mg2.5mL2mg/mL12.5 units
10mg2mL5mg/mL5 units
10mg3mL3.33mg/mL7.5 units

More water = easier to measure small doses but vial runs out faster. Find the balance that works for your dose.

19 19kate.chem, DataDave, Dr.GutHealth and 16 others
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