In general, the cause of bad breath should first be identified and the appropriate medication should be given according to the cause.
If the bad breath is caused by an infection focus in the mouth, antibiotics etc. may be prescribed in addition to the appropriate specialist treatment in dentistry; if the bad breath is caused by Helicobacter pylori infection, common medications include quadruple therapy including proton pump inhibitors, antibiotics and bismuth; if the bad breath is caused by a systemic disease, such as diabetes, common medications are glucose-lowering oral medications or insulin etc.