A chemical that kills or reduces the reproduction rates of organisms.[1] Such chemicals may be secreted by living organisms (such as penicillin, which is produced by certain molds) or they may be artificially synthesized.
Common antibiotics include azithromycin, doxycycline, metronidazole, and ciprofloxacin. Azithromycin is reportedly effective, along with other medication such as HCQ and zinc, in treating COVID-19.