Inhibitory Concentration 50

**Definition:** The concentration of a compound needed to reduce population growth of organisms, including eukaryotic cells, by 50% in vitro. Though often expressed to denote in vitro antibacterial activity, it is also used as a benchmark for cytotoxicity to eukaryotic cells in culture.

**Tree numbers:** - E05.940.350 - G07.690.936.563

**Synonyms:** - IC50