TrialTracker_MD 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.
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…
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.
DebRD_ATL said:I am going to disagree with reconstituting low as a general rule.
Ongoing cost tracking for dosing arithmetic — transparency for the community:
Monthly medication cost: $110
Supplies (syringes, BAC water, alcohol swabs): ~$8/month
Janoshik testing: ~$10/month (amortized quarterly)
Lab work: ~$50/month (amortized quarterly)
Total: ~$210/month
Compare to brand Wegovy at $1250/month without insurance. Compounded is roughly 85% cheaper for what I have found to be clinically equivalent medication.
Sigma-Aldrich — Research-Grade Standards
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Shop Reference StandardsOne thing that is still open after B12Beth’s answer:
How to check the arithmetic without trusting a website calculator, since three calculators gave me three answers?
OP 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.