antibiotic

/ˌæn(t)ibaɪˈɑdɪk/
/ˌænˌtaɪbaɪˈɑdɪk/

noun

A medicine (such as penicillin or its derivatives) that inhibits the growth of or destroys microorganisms.

course of antibiotics

adjective

Relating to, involving, or denoting antibiotics.

a prolonged course of antibiotic therapy