What does reconstitution mean?
Reconstitution is the process of adding a specified liquid to a dry or concentrated product so it reaches a usable concentration. The product instructions or a healthcare professional should determine the correct liquid, volume, technique and storage conditions.
The three labelled values behind the calculation
- Total amount in the vial, such as milligrams, micrograms or international units.
- Total liquid volume after preparation, measured in millilitres.
- Intended amount per use, in a compatible unit.
Why concentration matters
Adding more liquid does not change the total amount of active ingredient in the vial. It changes how much active ingredient is present in each millilitre.
Use compatible units
Milligrams and micrograms can be converted because they measure mass. International units describe biological activity and must not be treated as milligrams or micrograms unless the product provides a specific conversion.
Before relying on a result
Check the label, decimal point, unit, total liquid volume and syringe scale. When anything is unclear, stop and confirm it with a pharmacist, prescriber or other qualified professional.