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Tetracycline
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Information @ a Glance
Introduction
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Tetracycline is an
antibiotic used to treat conditions including acne and respiratory
infections.
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It belongs to a group
of antibiotics that includes minocycline, oxytetracycline,
doxycycline, and other related antibiotics.
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Tetracyclines were
discovered in the late 1940s and were extremely popular when they
were first introduced.
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Tetracyclines got
their name because they share a chemical structure that has four
rings.They were originally derived from soil bacteria Streptomyces
aureofaciens.
Mode of
action
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Tetracycline works by
interfering with the ability of bacteria to produce proteins that
are essential to them. Without these proteins the bacteria cannot
grow, multiply and increase in numbers. Tetracycline therefore stops
the spread of the infection and the remaining bacteria are killed by
the immune system or eventually die.
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Tetracyclines act at
the ribosomal level where they interfere with the protein synthesis
of susceptible bacteria. They also have several non-antibiotic
properties:
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Anti-inflammatory
effects
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Inhibition of
metalloproteinases (enzymes that inhibit collagen and gelatin
production)
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Reduction of new
blood vessel formation (angiogenesis)
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Reduction of
programmed cell death (apoptosis)
Research
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Researchers have
studied the outcome of pregnancies when women took tetracycline
during the first trimester (the first 12 weeks), which is the period
when all the body organs are forming. These studies have not shown
an increased risk for major birth defects in children exposed to
tetracycline in the first trimester of pregnancy.
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There may be a small
increased risk for minor birth defects such as an inguinal hernia,
but the number of reports is too small to be sure this risk exists.
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In a baby, the bones
and teeth continue to harden until one year of age. Therefore, if a
baby is exposed to tetracycline in breast milk, theoretically it
could cause tooth discoloration and delayed bone growth. Yet, since
only very low levels of tetracycline enter into the breast milk, no
problems have been reported in nursing babies.
-
The American Academy
of Pediatrics has rated tetracycline as usually compatible with
breastfeeding. Also, the WHO Working Group on Human Lactation states
that when the antibiotic is used for seven to 10 days while nursing,
the risk to the infant appears to be low.
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