<p><strong>Pregnancy</strong>: Studies have not been done in humans. In studies in rats and rabbits, chlortetracycline and tetracycline topical preparations have not been shown to cause birth defects or other problems. However, studies in rabbits have shown meclocycline to cause a slight delay in bone formation.<br />
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<strong>Breast feeding</strong>: It is not known whether tetracycline topical preparations pass into breast milk. Although most medicines pass into breast milk in small amounts, many of them may be used safely while breast-feeding. Mothers who are using any of these medicines and who wish to breast-feed should discuss this with their doctor.</p>