V/Vm, or "V over Vm," is a term used in pharmacology to describe the ratio of the volume of a drug solution (V) to the volume of the medium (Vm) in which it is dissolved. This ratio helps in understanding the concentration of the drug in a given solution, which is crucial for determining the appropriate dosage and effectiveness of the medication. In clinical settings, V/Vm is important for ensuring that patients receive the correct amount of a drug, such as antibiotics or chemotherapy agents. Proper calculations of this ratio can prevent underdosing or overdosing, ultimately contributing to better patient outcomes and safety.