Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.
Make sure your doctor knows if you are taking barbiturates (phenobarbital, Fiorinal®, Brevital®, Mysoline®, Seconal®), Antabuse®, phenytoin (Dilantin®), or blood thinners (Coumadin®).
Avoid drinking alcohol while taking metronidazole. This includes cough syrup or any other liquid that might contain alcohol. Alcohol in combination with this medicine can make you very sick and cause vomiting, dizziness, and flushing.
If you are pregnant or breastfeeding, talk with your doctor before using this medicine.
Before using this medicine, make sure your doctor knows if you have liver disease, a blood disorder, heart problems, swelling or bloating, a seizure disorder (epilepsy), or numbness in your hands or feet.
Tell your doctor or dentist you are using metronidazole before you have any kind of surgery that requires general anesthesia.
If your infection does not improve or gets worse after taking this medicine for several days, or if you continue to have fevers, talk to your doctor.