Tetracycline is an antibiotic that helps your body fight off the infection caused by the presence of bacteria. Therefore, your imbue system can deal with the infection more efficiently. Your health care provider may prescribe this medicine if you need to be treating urinary tract infections, acne, gonorrhea, chlamydia, and a number of other conditions you have. However, tetracycline is not going to treat a viral infection, such as cold or flu. Tetracycline is FDA pregnancy category D - it is not supposed to be taken by pregnant or breastfeeding women, as it may cause the baby to have permanent teeth discoloration later in life. It can also affect the bone and tooth development in the baby. Make sure you use reliable forms of birth control and keep in mind that tetracycline can make birth control pills less effective. If you are taking any medications - make sure you let your doctor know about them before starting the treatment, as otherwise interactions are possible. The following drugs have been reported to cause interactions: blood thinners, penicillin antibiotics, cholesterol-lowering medications, minerals, and antacids. Please report any supplements or vitamins as well if you are taking them at the moment to provide for maximum efficiency of your treatment.