Tooth/tongue staining, increased tartar, mouth/throat irritation, dry mouth, and change in taste of food/drinks may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. To decrease staining of teeth and mouth surfaces, brush with toothpaste 3 times daily, brushing more on the stained areas. Use of a "tartar control" toothpaste and electric toothbrush may be more effective. See your dentist at least every 6 months for tooth cleaning/tartar removal. Staining from this medication that may occur on dental work (such as crowns or veneers) usually can only be removed by a dentist/hygienist. To decrease the effect on how food tastes, eat first, followed by tooth brushing and then chlorhexidine rinse. Remember that this medication has been prescribed because your doctor or dentist has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: mouth or skin rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.