Metronidazole is mainly available in tablet, injection and suppository forms. It has a powerful killing effect on trichomonas and ameba protozoa, and can also be used to treat anaerobic bacterial infections, mainly for the treatment of amebic dysentery and amebic liver abscess and trichomonas vaginitis, etc. It is very effective with few side effects and easy to use. It is mainly used in gynecology for the treatment of trichomoniasis and is usually administered intravenously, orally and intravaginally with metronidazole suppositories. It is also effective for periodontitis and is mostly used externally to treat acne, scabies, and rosacea. Of course, there are certain side effects, commonly loss of appetite, oral odor, nausea, vomiting, etc. It is generally used after meals to effectively reduce the symptoms of adverse reactions.