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tetracycline (tet″rә-siŽklēn)   any of a group of related broad-spectrum antibiotics; some are isolated from certain species of Streptomyces and others are produced semisynthetically. The group includes chlortetracycline, demeclocycline, doxycycline, minocycline, oxytetracycline, and tetracycline (def. 2). Tetracyclines are effective against a wide range of aerobic and anaerobic gram-positive and gram-negative bacteria, and are used particularly for rickettsiae, mycoplasmas, and chlamydiae; they are also effective against certain protozoa.
  a semisynthetic antibiotic having the same wide spectrum of antimicrobial activity as other members of the tetracycline group; administered orally. The hydrochloride salt has similar actions and is administered orally, intramuscularly, intravenously, or topically to the skin or conjunctiva.




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