What is the pharmacological treatment for Trichomonas vaginitis?

The pharmacological treatment for Trichomonas vaginitis is metronidazole. This medication is an antimicrobial agent specifically effective against protozoal infections, including Trichomonas vaginalis, which is the causative agent of this condition. Metronidazole works by disrupting the DNA of the protozoa, ultimately leading to its death and resolution of the infection.

In this context, other options do not appropriately target the organism responsible for Trichomonas vaginitis. Amoxicillin is primarily a penicillin antibiotic that is effective against bacterial infections but is not effective against protozoa. Fluconazole is an antifungal medication that treats fungal infections, particularly those caused by Candida species, rather than protozoal infections. Doxycycline is a tetracycline antibiotic that is effective against certain bacterial infections but similarly does not target Trichomonas vaginalis. Therefore, metronidazole is the correct choice for treating Trichomonas vaginitis due to its specific efficacy against the protozoa involved.