Metronidazole is an antibiotic, according to Drugs.com. It is used in the treatment of bacterial infections of the vagina, joints, stomach, skin and respiratory tract. However, this medication is ineffective for treating a vaginal yeast infection.
According to Drugs.com, metronidazole should be taken for the entire time period prescribed by a doctor, as symptoms may get better before the infection is gone. Missing doses of metronidazole may increase the chances of further infection that is not affected by antibiotics. Alcohol should not be consumed while taking this medication or for three days following stopping the use of it. Side effects may include rapid heartbeat, a tingling sensation, nausea or vomiting.