sarah_TO said:Dead space is the answer to the missing dose.
For anyone reconstituting dosing arithmetic peptides: the water-to-powder ratio determines your concentration. Here's my reference:
| Vial Size | BAC Water | Concentration | 0.25mg Dose |
|---|---|---|---|
| 5mg | 2mL | 2.5mg/mL | 10 units |
| 5mg | 2.5mL | 2mg/mL | 12.5 units |
| 10mg | 2mL | 5mg/mL | 5 units |
| 10mg | 3mL | 3.33mg/mL | 7.5 units |
More water = easier to measure small doses but vial runs out faster. Find the balance that works for your dose.
A narrower follow-up, since the general answer is now clear:
How to check the arithmetic without trusting a website calculator, since three calculators gave me three answers?
raj_cambridge said:For anyone reconstituting dosing arithmetic peptides: the water-to-powder ratio determines your concentration.
Sharing my dosing arithmetic titration experience with compounded semaglutide — I have been tracking injection volumes meticulously:
Using 5mg/2mL concentration with 1cc insulin syringes:
- Month 1: 10 units (0.25mg) — mild appetite reduction
- Month 2: 20 units (0.5mg) — significant appetite suppression
- Month 3: 30 units (0.75mg) — custom intermediate dose
- Month 4: 40 units (1.0mg) — optimal for me, staying here
The beauty of compounded vials is you can do custom intermediate doses. My provider was great about tailoring to my response.
Sigma-Aldrich — Research-Grade Standards
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Shop Reference StandardsOP back with an update, since a thread like this is useless without one.
My error was treating units as a mass. Once I wrote mg/ml on the vial in marker and worked in millilitres first, the two of us got the same answer.
newstart_MO said:Sharing my dosing arithmetic titration experience with compounded semaglutide — I have been tracking injection volumes meticulously: Using 5mg/2mL…
Agreed, and it is worth saying that rounding to the nearest whole unit is usually acceptable at maintenance doses and is not acceptable at the bottom of a ladder, where one unit can be a fifth of the intended dose.