The rifamycins are a group of antibiotics that are synthesized either naturally by the bacterium Amycolatopsis rifamycinica or artificially. They are a subclass of the larger family of ansamycins. Rifamycins are particularly effective against mycobacteria, and are therefore used to treat tuberculosis, leprosy, and mycobacterium avium complex (MAC)...
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http://en.wikipedia.org/wiki/Rifamycin
<drug> Antibiotic produced by Streptomyces mediterranei that acts by inhibiting prokaryotic, but not eukaryotic DNA dependent RNA synthesis. Blocks initiation, but not elongation of transcripts. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973
(rif″ә-mi´sin) any of a family of antibiotics biosynthesized by a strain of Streptomyces mediterranei, effective against a broad spectrum of bacteria. The five components are designated A, B, C, D, and E; rifamycins O, S, and SV are derivatives of the B component, and AG and X are derivatives of the O compon...
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http://www.encyclo.co.uk/local/21001
Antibiotic produced by Streptomyces mediterranei that acts by inhibiting prokaryotic, but not eukaryotic DNA-dependent RNA synthesis. Blocks initiation, but not elongation of transcripts.
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http://www.encyclo.co.uk/visitor-contributions.php
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