Trichomoniasis is an infection, caused by the Trichomonas organism, that affects both women and men. In women, the outer female genitalia and the vagina are affected. In men, the penis is mainly affected, but the prostate and other reproductive organs can also be involved. Trichomoniasis is a sexually transmitted disease (STD) and is most often passed to another person through sexual contact. The majority of people who get trichomoniasis, do so from a sexual encounter and are also at risk for other STDs, including gonorrhea and chlamydia, hepatitis B, and HIV. Trichomoniasis can increase the risk for HIV and pregnancy problems.


  • Abnormal gray-green, frothy vaginal discharge in women.

  • Itching and irritation of the area outside the vagina in women.

  • Penile discharge with or without pain in males.

  • Inflammation of the urethra (urethritis), causing painful urination.

  • Bleeding after sexual intercourse.


  • Take all medication prescribed by your caregiver.

  • Take over-the-counter medication for itching or irritation as directed by your caregiver.

  • Do not have sexual intercourse while you have the infection.

  • Do not douche or wear tampons while you have the infection.

  • Discuss the infection with your partner, as your partner may have acquired the infection from you. Or, your partner may have been the person who transmitted the infection to you.

  • Have your sex partner examined and treated if necessary.

  • Practice safe, informed, and protected sex.

  • See your caregiver for other STD testing.


  • You still have symptoms after you finish the medication.

  • You have an oral temperature above 102° F (38.9° C).

  • You develop belly (abdominal) pain.

  • You have pain when you urinate.

  • You have bleeding after sexual intercourse.

  • You develop a rash.

  • The medication makes you sick or throw up (vomit).