Tinidazole preparations are effective agents for the therapy of genitourinary trichomoniasis in women and men. The application of these drugs is very simple and, in particular, suitable as the application time is short and the occurrence of slight side effects shows a very low incidence. Unfortunately, these medicaments cannot be used during pregnancy and lactation. In addition, definite therapeutical recommendations are lacking and the published specific experiences in the therapy of obese persons with these drugs should be verified in future.