Streptomyces

Tetracyclines are available only with a physician's prescription. They are sold in capsule, tablet, liquid, and injectable forms

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Among the drugs that may interact with tetracyclines are: antacids, calcium supplements, medicines that contain iron.

.Tetracyclines may increase the skin's sensitivity to sunlight.Pregnant women should not take tetracyclines during the last four months of pregnancy.People with certain medical conditions or who are taking other medicines may have problems.