Guides
11 pages in this section, most recently updated September 4, 2026.
- 01
How to use the dose unit converter
A walkthrough of the converter: what to type, what each result means, and the two checks that catch almost every drawing-up error before it happens.
Updated September 4, 2026
- 02
Units versus mL: the mistake that changes a dose tenfold
Why insulin-syringe units are a volume scale, how the same word gets used for three different things, and the arithmetic that keeps a 0.25 mL dose from becoming 2.5 mL.
Updated September 4, 2026
- 03
How to read the concentration on a compounded vial
The four ways a pharmacy writes concentration, how to turn each into mg/mL, and what to do when the label and the prescription disagree.
Updated September 4, 2026
- 04
Syringe graduations and rounding: why the 0.3 mL syringe exists
How the three common insulin syringe sizes are marked, how much rounding each one forces on a small dose, and how to pick a syringe so the rounding error stays trivial.
Updated September 4, 2026
- 05
How to use the injection schedule generator
Turning a start date and a set of titration steps into dated injections and a calendar file, with the label rules the templates follow and the decisions the tool deliberately leaves to your prescriber.
Updated September 4, 2026
- 06
What a population average means: reading the weight-loss projection
Where the STEP 1 and SURMOUNT-1 numbers come from, what the curve between week 0 and the endpoint is and is not, and the three reasons your own result will differ from the line.
Updated September 4, 2026
- 07
Cost per mg: comparing quotes that are written differently
How to normalise a per-vial price, a per-month program and a per-pen list price onto one scale, why a month is 4.33 weeks, and where waste hides in the comparison.
Updated September 4, 2026
- 08
BMI: what it measures, and where the label thresholds come from
The formula, the WHO categories, why the Wegovy and Zepbound labels mention 27 and 30, and what BMI cannot tell you about your body.
Updated September 4, 2026
- 09
Protein targets on a GLP-1: how the arithmetic works
Where the 0.8, 1.2 to 1.6 and 1.4 to 2.0 grams-per-kilogram figures come from, which body weight to multiply, and how to split the total when appetite is the limiting factor.
Updated September 4, 2026
- 10
Reconstitution arithmetic for pharmacy-dispensed vials
How powder mass and diluent volume become a working concentration, why adding more water changes the volume but not the dose, and how to check a pharmacy's instructions against your own numbers.
Updated September 4, 2026
- 11
Five checks before every injection
A short, repeatable routine that catches concentration changes, unit confusion, wrong syringes, wrong days and wrong steps before the needle goes in.
Updated September 4, 2026