No, penicillin does not treat trichomoniasis. Trichomoniasis is a sexually transmitted infection caused by the parasite Trichomonas vaginalis, and it is typically treated with specific antibiotics such as metronidazole or tinidazole.
Penicillin, on the other hand, is an antibiotic that is effective against certain bacterial infections but does not have any efficacy against parasitic infections like trichomoniasis. Therefore, if someone is diagnosed with trichomoniasis, it is important for them to seek appropriate treatment from a healthcare professional who can prescribe the correct medication.