The Tetracycline reference article from the English Wikipedia on 24-Apr-2004
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Tetracycline

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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

Tetracycline use should be avoided during pregnancy and in the very young (less than 6 years) because it will result in permanent staining of teeth causing an unsightly cosmetic result.