But if 2 separate partners have had trich, especially if it seems likely you infected them, you probably have it.
Despite common recommendations for single-dose metronidazole
, which works well in women, no research has ever shown whether it is effective in men, and stories of treatment failure (like yours) are common. You should ask your provider for more prolonged treatment with metronidazole, e.g. 500 mg twice daily for 5 days.