Which treatment is commonly used for trichomoniasis?

Metronidazole is the standard treatment for trichomoniasis, a sexually transmitted infection caused by the protozoan parasite Trichomonas vaginalis. This medication is effective against anaerobic bacteria and certain protozoa, making it an appropriate choice for treating this specific infection.

Metronidazole can be administered in a single dose or as a longer course, depending on the severity and clinical characteristics of the infection. It works by entering the parasite's cells and disrupting its DNA synthesis, ultimately leading to cell death.

Other medications listed, such as azithromycin and doxycycline, are primarily used for bacterial infections and do not possess efficacy against Trichomonas vaginalis. An asthma inhaler has no relevance in the context of treating trichomoniasis, as it is designed to help manage asthma and does not address infections caused by parasites. Thus, metronidazole stands out as the appropriate and effective treatment for trichomoniasis.