Tetracyclines are a group of antibiotics originally found in Streptomyces bacteria. Tetracyclines can be used against respiratory-tract infections, syphilis, and acne. Among the tetracyclines, there are chlortetracycline, doxycycline, oxytetracycline, and the original tetracycline.
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Tetracycline use should be avoided in the very young (less than 6 years) because it will result in permanent staining of teeth causing an unsightly cosmetic result.