ri·fam·pin 
(rĭ-fămpĭn)
(rĭ-fămpĭn)n.
A semisynthetic antibiotic, C43H58N4O12, that is derived from a form of rifamycin and interferes with bacterial RNA synthesis, used to treat tuberculosis and other bacterial infections. Also called rifampicin.
[RIF(OMYCIN) + A(MINO-) + M(ETHYL) + P(IPERAZINE) + -IN.]
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