Metronidazole is an antibiotic used to fight bacterial infections. It does not treat vaginal yeast infection. Do not give to children without medical guidance. May be given to sexual partner (ask doctor for clarification). 

Inform doctor of all medical conditions and drugs you use prior to using metronidazole, including Cockayne syndrome, blood cell disorders, fungal infections, and liver or kidney disease. Metronidazole may interact with other drugs such as blood thinners and lithium. Take for prescribed amount of time. May cause unusual medical test results, so inform all medical personnel of your metronidazole use.

Do not take if you have taken disulfiram within the past 2 weeks. Do not use if allergic. Do not consume alcohol, foods, or medicine that contain propylene glycol during metronidazole treatment and at least 1 day after stopping treatment. Avoid alcohol and propylene glycol for at least 3 days after end of usage. May be harmful if used during first trimester of pregnancy. Can cause life-threatening liver problems in patients with Cockayne syndrome.

Animal studies suggest this medicine may cause possible tumors and cancers. May cause nervous system abnormalities and seizures. Cease use and find help if you encounter neurological effects. Seek immediate medical assistance should you suspect an allergic reaction or overdose. Call doctor if you experience diarrhea, and do not use anti-diarrhea without doctor approval. Contact doctor immediately if you experience serious effects like: diarrhea, pain/difficulty urinating, sleep trouble, mood changes, headache, dizziness, weakness, lightheadedness, neurological effects, signs of liver failure. May cause digestive problems, rash, vaginal discharge, unpleasant metallic taste.