Some drugs need to be reconstituted from their stable powder form into a solution before injection. When reconstituting a medication, the nurse first draws up the appropriate amount of diluent into a syringe. This is usually the total volume of fluid that will be injected. The diluent is injected into the vial to dissolve the powder. Once the powder is dissolved, the resulting solution is drawn up and injected into the patient. Additional air should not be added to the system.