SIDE EFFECTS: Constipation may occur. This could lead to other problems such as hemorrhoids and bowel obstruction. If constipation persists or worsens, contact your doctor or pharmacist promptly. 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. To minimize constipation, drink plenty of fluids and exercise. Using an antacid that contains magnesium along with this product can help prevent constipation. Stool softeners may also be helpful. Ask your doctor or pharmacist about other antacids, stool softeners and laxatives. Aluminum-containing antacids bind to phosphate, an important body chemical, in the gut. This can cause low phosphate levels if your kidneys are normal, especially if you use large doses 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. 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, 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.

PRECAUTIONS: Before taking aluminum hydroxide, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. If you have any of the following health problems, consult your doctor or pharmacist before using this product: frequent alcohol use, severe loss of body water (dehydration/fluid restriction), problems with constipation, kidney problems (including kidney stones). During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor. This medication may pass into breast milk. Consult your doctor before breast-feeding.

DRUG INTERACTIONS: See also How to Use section. Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval. Antacids can interfere with the absorption of many other drugs. Be sure to check with your pharmacist before taking antacids with any other medication.

OVERDOSE: If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center.