Metronidazole should be stored at room temperature and protected from light. Metronidazole is a valuable antibiotic and is generally well tolerated with appropriate use. Metronidazole is an antibiotic effective against anaerobic bacteria and certain parasites. Metronidazole is an imidazole antibiotic that is used in the first trimester of pregnancy. Metronidazole should be used with caution in patients with active or chronic severe peripheral and central nervous system diseases due to the risk of neurological aggravation.