Metronidazole, tinidazole and clarithromycin capsules, targeted treatment role is different, so there is no which one is better, should be used in conjunction with the doctor. Metronidazole is an anti-anaerobic drug, anti-trichomonas drug, can be used to treat intestinal or extra-intestinal amebiasis, vaginal trichomoniasis, etc., but also widely used in the treatment of anaerobic infections. Tinidazole is a systemic antimicrobial and gynecological anti-infective drug, which can be used to reduce the formation of drug-resistant bacteria and to ensure the effectiveness of tinidazole, as well as other antimicrobial drugs, and can be used to treat or prevent infections caused by proven or suspected susceptible pathogens. Clarithromycin capsules are systemic antimicrobials and can be used for nasopharyngeal infections, lower respiratory tract infections, soft tissue skin infections, acute otitis media, urethritis, and cervicitis associated with Clarithromycin-susceptible bacteria. If the patient is allergic to some components or excipients in the drug of metronidazole, tinidazole, clarithromycin capsules, the drug should be avoided, and need to be used in strict accordance with medical advice to avoid adverse effects.