Do not drink alcohol when on Ornidazole and at least for 3 days after stopping the medication as it could lead to antabuse like reaction characterized by flushing, tingling& numbness, fever, nausea and vomiting.
Ornidazole can cause drowsiness. Avoid activities which require you to be alert.
Ornidazole may harm an unborn baby if used during pregnancy but potential benefit may warrant use of the drug in pregnant woman despite potential risks. Always inform your doctor if you are pregnant or are planning for conception.