Constipation, dry mouth, upset stomach, gas, and nausea may occur. If any of these effects last or get worse, notify your doctor or pharmacist promptly. Remember that this medication has been prescribed because your doctor 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. Tell your doctor right away if you have any serious side effects, including: an unusual feeling of fullness in the stomach that doesn't go away, nausea/vomiting/stomach pain especially after meals. 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: 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.

Some products that may interact with this drug include: antacids that contain aluminum, certain antibiotics (including quinolones such as ciprofloxacin/levofloxacin/ofloxacin, tetracyclines), digoxin, ketoconazole, levoketoconazole, penicillamine, phenytoin, quinidine, thyroid medications (such as levothyroxine, liothyronine).