Tyrocidine

**Definition:** An antibiotic mixture produced by Bacillus brevis which may be separated into three components, tyrocidines A, B, and C. It is the major constituent (40-60 per cent) of tyrothricin, gramicidin accounting for the remaining 10-20 per cent active material. It is a topical antimicrobial agent, that is very toxic parenterally.

**Tree numbers:** - D04.345.566.850.920 - D12.644.641.850.920

**Synonyms:** - Tyrocidines