Tetracycline is a prescription antibiotic used to treat infections caused by bacteria. Children younger than 8 are not supposed to be given this medicine as it can cause graying or yellowing of their teeth later in life. You will need to use an efficient method of birth control, but keep in mind that hormonal methods can be less efficient if you are taking tetracycline. This drug has been reported to make your skin more sensitive to sunlight. You will need to try to avoid sun exposure to make sure you do not get a sunburn. Tetracycline is usually taken on an empty stomach an hours before or 2 hours after having a meal. Make sure you do not take tetracycline with milk or any other dairy products as it may be more difficult for your body to absorb the medicine. Tetracycline can cause some minor side effects that are usually short-lived and can be any of the following ones: stomach upset, vomiting, swollen tongue, diarrhea, sores or swelling in your rectal area, mild nausea, and vaginal itching. Let your doctor know if you are taking cholesterol-lowering medications, antacids, blood thinners, penicillin antibiotics, or minerals, as they may interfere with tetracycline and make it less efficient.