Researchers believe a teratogen can affect a developing fetus about 10 to14 days after conception. The best way to reduce the risk of exposure to teratogens during pregnancy is to avoid taking. Uses. Tetracycline is used to treat a wide variety of infections, including acne. It is an antibiotic that works by stopping the growth of bacteria. Pylera contains a combination of bismuth subcitrate potassium, metronidazole, and tetracycline. Bismuth subcitrate potassium is a mineral. Metronidazole and tetracycline are antibiotics that fight bacteria in the body. Chapter 3. How Antibiotic Therapy Works to Ensure Fertility. Typically, when people go to a fertility specialist, they're prepared to be patients in the most literal sense of the term. What should I discuss with my healthcare provider before taking doxycycline? You should not take this medicine if you are allergic to doxycycline or other tetracycline antibiotics such as demeclocycline, minocycline, tetracycline, or tigecycline. When I was a little boy, I remember seeing my brother in the bathroom trying to bleach his teeth. He tried many different formulations of bleaching agents to try to remove the staining on his teeth. Why Does My Dog Have Seizures? Written by: Roy Dvorak. A dog may seizure for any number of reasons. Just because a dog has a seizure does not mean that the dog has epilepsy. WARNINGS: Women who are pregnant must not use isotretinoin. Women must avoid becoming pregnant while taking this medication. Serious (sometimes fatal) birth defects, miscarriages, and premature. Tetracycline is an antibiotic that fights infection caused by bacteria. Tetracycline is used to treat many different bacterial infections of the skin, intestines, respiratory tract, urinary tract, genitals, lymph nodes, and other body systems. Should women on combination oral contraceptives receive alternative forms of contraception when receiving antibiotics?.