Two reconstitution volumes for the same vial, compared honestly

Two reconstitution volumes for the same vial, compared honestly

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Given a vial of a fixed strength, the choice of how much bacteriostatic water to add is genuinely yours, and it is worth thinking about for ten seconds rather than defaulting to whatever number you saw first.

More diluent gives a lower concentration and therefore a larger volume per dose. Larger volumes are easier to measure accurately, land more often on clean syringe marks, and make rounding errors proportionally smaller. The cost is that the vial holds more liquid, and a small vial may not physically take the volume you had in mind.

Less diluent gives a higher concentration and a smaller volume per dose. That is convenient for a large dose and a small syringe, and it is unforgiving for a small one. At high concentration a two-mark misread is a large fraction of the dose.

The way to choose is to run the arithmetic for the doses you expect to be taking over the life of the vial, not just today's dose. If you are mid-titration, check the next step up too. A mix that is perfect at your current dose and awkward at the next one will annoy you for weeks.

I sanity check both options in a peptide dose calculator before mixing, because seeing the two dose volumes side by side makes the decision obvious in a way that doing one calculation does not.

Whatever you choose, the number goes on the vial. A well chosen concentration that nobody recorded is the same as a badly chosen one.

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