why does flagyl cause headaches
Do not take metronidazole if you have taken disulfiram (AntabuseÂ®) within the last 2 weeks. Using these medicines together may cause serious unwanted effects. Drinking alcoholic beverages while using this medicine may cause stomach pain, nausea, vomiting, headache, or flushing or redness of the face. Other alcohol-containing preparations (eg, elixirs, cough syrups, tonics) may also cause problems.