Secnidazole is an antibacterial medication that treats vaginal infections caused by bacteria. Secnidazole is used to treat parasitic and bacterial infections such as amoeba. Secnidazole is mainly used to kill excessive bacteria in the vagina, which leads to several symptoms such as vaginal itching, bad odor, burning during urination, and vaginal discharge. It is also used to treat trichomoniasis, which is a protozoan infection in males and females.