This quantitative measure indicates how much of a particular drug or other substance (inhibitor) is needed to inhibit a given biological process (or component of a process, i.e. an enzyme, cell, cell receptor or microorganism) by half.
Ova kvantitativna mera je indikator mere u kojoj je dati lek ili druga supstanca (inhibitor) neophodna da se inhibira dati biološki process (ili komponentu procesa, i.e. enzim, ćeliju, ćelijski receptor ili mikroorganizam) za polovinu.