The diagnosis of trichomoniasis can be confirmed by looking at a sample of vaginal fluid for women or urine for men under a microscope. Growing a culture used to be the way to diagnose trichomoniasis, but newer, faster tests, such as rapid antigen tests and nucleic acid amplification, are more common now.


The most common treatment for trichomoniasis, even for pregnant women, is to swallow one megadose of either metronidazole (Flagyl) or tinidazole (Tindamax). Both you and your partner need treatment. And you need to avoid sexual intercourse until the infection is cured, which takes about a week.

Don't drink alcohol for 24 hours after taking metronidazole or 72 hours after taking tinidazole, because it can cause severe nausea and vomiting.

Preparing for your appointment

Your family doctor, gynecologist or a medical practitioner at an urgent care center can diagnose and prescribe treatment for trichomoniasis.

What you can do

Before the appointment, you might want to prepare a list that includes:

  • A detailed description of your symptoms, including when they started
  • Sexually transmitted infections you've had
  • The number of sexual partners you've had during the past few years

What to expect from your doctor

For women, your doctor will perform a pelvic exam and may take a sample of your vaginal fluids for testing.

March 21, 2015
  1. Sobel JD. Trichomoniasis. http://www.uptodate.com/home. Accessed Jan. 23, 2015.
  2. Trichomoniasis fact sheet. Centers for Disease Control and Prevention. http://www.cdc.gov/STD/Trichomonas/STDFact-Trichomoniasis.htm. Accessed Jan. 23, 2015.
  3. Hobbs MM, et al. Modern diagnosis of trichomonas vaginalis infection. Sexually Transmitted Infections. 2013;89:434.