What is a common treatment for Trichomonas vaginalis infection?

• A. Metronidazole
• B. Penicillin
• C. Isoniazid
• D. Amphotericin B

Answer: (A)

Treating Trichomonas vaginalis hinges on using an agent that is specifically effective against anaerobic protozoa. Metronidazole is the drug of choice because it is activated in anaerobic organisms to form reactive metabolites that damage the parasite’s DNA and other essential molecules, quickly killing Trichomonas in the urogenital tract. Other drugs listed target bacteria or fungi and do not act on protozoa: penicillin disrupts bacterial cell walls, isoniazid inhibits mycobacterial cell wall synthesis, and amphotericin B targets fungal membranes. Because of their different targets and mechanisms, they are not effective against Trichomonas, making metronidazole the best answer.