If they do occur, typical symptoms for women include vaginal itching and burning, a greenish-yellow vaginal discharge, and burning or pain when urinating. Sexual intercourse can be painful. In men, symptoms include mild itching and irritation of the penis, pain during intercourse and discomfort when urinating. Men who have trichomoniasis usually don't experience any symptoms. This may infect their sexual partners and not know it.
Trichomoniasis is diagnosed by examining a drop of vaginal fluid under a microscope.
If you're a woman, don't take this drug during the first three months of pregnancy. Avoid drinking alcohol for 24 hours before, during and 24 hours after taking the metronidazole. The combination causes vomiting, dizziness and headaches. Sexual partners of an infected person should also be treated to prevent getting infected again, or spreading the infection further. Limiting your sexual activity to one person your entire life is a close second, provided your partner is also monogamous and does not have a sexually transmitted disease.