Does metronidazole gel treat trichomaniasis?

No. The gel has a failure rate of over 50%, which is pretty bad when you consider the pill form of Metronidazole has a cure success of about 95%. The pill form can even be adapted to treat a pregnant woman. Be sure your partner is treated too. Follow up within 3 months for recheck though; reinfection is extremely common and most be monitored because infection can become silent.