Historical clue formulations

• Bacteria-inhibiting drug — 2021-12-15
• Bacteria-battling drug — 2017-06-18
• Certain bacteria-fighting drug — 2014-03-25
• Kind of drug — 2010-02-07
• Kind of drug that inhibits bacteria — 2009-03-01
• Infection fighter — 2004-05-05
• Infection-fighting drug — 2004-03-19
• ___ drug (infection fighter) — 2003-12-09
• Bacteria-inhibiting drug — 1997-11-26
• Antibiotics' ancestor — 1995-09-17