Metronidazole is used to treat a certain type of vaginal infection (bacterial vaginosis) in women who are not pregnant. Metronidazole is an antibiotic that works by stopping the growth of bacteria. Find out how metronidazole treats infections and how to take it. NHS medicines information on metronidazole – what it's used for, side effects, dosage and who can take it. Metronidazole is used to treat trichomoniasis, amebiasis, and serious anaerobic bacterial infections including abdominal, skin, gynecologic, and CNS infections. Metronidazole is primarily used to treat: bacterial vaginosis, pelvic inflammatory disease (along with other antibacterials like ceftriaxone), pseudomembranous colitis, aspiration pneumonia, rosacea (topical), fungating wounds (topical), intra-abdominal infections, lung abscess, periodontal disease, amoebiasis, oral infections, giardiasis. What is metronidazole used for? Metronidazole is commonly used to treat the following infections caused by certain bacteria or parasites. Metronidazole may not be appropriate for some of. Metronidazole is used to treat infections of the reproductive system, gastrointestinal (GI) tract, skin, heart, bone, joint, lung, blood, nervous system, and other areas of the body. It is also used to treat certain sexually transmitted diseases (STDs). Metronidazole is an antibiotic that may be used to treat certain infections of the vagina, stomach, liver, skin, joints, brain and spinal cord, lungs, heart, or bloodstream. Metronidazole is a prescription antibiotic medication prescribed for the treatment of a variety of parasitic and bacterial infections of the vagina, gynecological area, skin, intra-abdominal cavity, blood, bone, joint, nervous system, and heart. Metronidazole is used to treat bacterial infections in different areas of the body. It is also used to treat infections caused by protozoa (eg, trichomoniasis and amebiasis) and infections caused by bacteria that do not need oxygen to survive. Learn what metronidazole is used for, including its role in treating bacterial and parasitic infections, skin conditions, and more. Explore benefits, uses, and precautions.