If your eyes glaze over at "mg per mL," you are normal. There is no hard math here — just four words and one idea.
- ✦mg = milligrams — how much powder is in the vial
- ✦mL = milliliters — how much liquid you add
- ✦Concentration = how strong the mix is (medicine per drop)
- ✦Units = fine markings on a U-100 syringe (100 units = 1 mL)
The one idea: when you mix the powder into the water, the medicine does not disappear — it spreads out. That is all concentration is.
✦ Key takeaway
Adding more water never changes the dose. It only changes how much liquid you draw. More water = more units. Same medicine.