This medication can cause nausea, constipation, diarrhea, or headache. If these symptoms persist or become severe, notify your doctor.
If your doctor has directed you to use this medication, remember that he or she 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.
The magnesium in this product can cause diarrhea. Using an antacid that contains only aluminum along with this product can help control diarrhea. The aluminum in this product can cause constipation. To minimize constipation, drink plenty of fluids and exercise. Diarrhea is more common with this product than constipation.
Aluminum-containing antacids bind to phosphate, an important body chemical, in the gut. This can cause low phosphate levels, especially if you use this medication in large doses and for a long time. Tell your doctor right away if you have any of the following symptoms of low phosphate: loss of appetite, unusual tiredness, muscle weakness.
Tell your doctor right away if any of these unlikely but serious side effects occur: dizziness, fainting.
Seek immediate medical attention if any of these rare but very serious side effects or symptoms of a serious medical problem occur: black/tarry stools, slow/shallow breathing, slow/irregular heartbeat, mental/mood changes (e.g., confusion), deep sleep, pain with urination, stomach/abdominal pain, vomit that looks like coffee grounds.
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention 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.