There is no medication in the United States that may help prevent trichomoniasis. In Europe, however, a vaccine for trichomoniasis has been marketed but has proven to be largely ineffective.

Having contracted trichomoniasis does not provide immunity against future infection. People who are successfully treated for trichomoniasis can become infected again if they are exposed to the parasite that causes the condition.

Certain preventive measures may help to reduce the risk of contracting trichomoniasis. These include:

• Refrain from having sexual intercourse. Complete abstinence (refraining from vaginal, anal and oral sex) is the best way to prevent becoming infected with trichomoniasis.
  
  
• Limit sexual activity to one partner. Restricting sexual relations to just one partner who is known to be free from infection can significantly reduce the risk of contracting trichomoniasis.
  
  
• Use condoms. Use of condoms during vaginal, anal and oral sex can substantially reduce (but not eliminate) the risk of contracting trichomoniasis. Condoms must be used every time a person has sex. Male latex condoms or female polyurethane condoms should be used during vaginal sex. Male condoms should be used during anal sex, and a rubber material known as a dental dam should be used during oral sex. Although female condoms and dental dams offer some protection against sexually transmitted diseases, they are not as effective as male latex condoms.
  
  
• Do not share swimsuits, towels, washcloths, bath sponges, loofahs or bath brushes. The trichomoniasis parasite can live outside the body for as long as 45 minutes and can be transmitted to someone whose genitals come in contact with damp objects that have the parasite on them.
  
  
• Exercise caution when using public restrooms because trichomoniasis can be transmitted through brief contact with a toilet seat that contains the parasite that causes trichomoniasis. Refrain from sitting directly on public toilet seats or use a protective paper sheet before sitting on the seat.