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PRECAUTIONS: Before taking calcium carbonate, tell your doctor or pharmacist if you are allergic to it; or to milk or dairy (found in certain brands); or if you have any other allergies.This product should not be used if you have certain medical conditions. Before using this product, consult your doctor or pharmacist if you have: high calcium levels (hypercalcemia), stomach/intestinal blockage.If you have any of the following health problems, consult your doctor or pharmacist before using this product: kidney disease (e.g., kidney stones).Some products may contain aspartame. If you have phenylketonuria (PKU) or any other condition that requires you to restrict your intake of aspartame (or phenylalanine), consult your doctor or pharmacist about using this drug safely.Tell your doctor if you are pregnant before using this medication.This medication passes into breast milk. Consult your doctor before breast-feeding.

DRUG INTERACTIONS: If you are taking this product under your doctor's direction, your doctor or pharmacist may already be aware of possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor or pharmacist first.Before using this product, tell your doctor or pharmacist if you use any of the following products: digoxin, certain phosphate binders (e.g., calcium acetate), phosphate supplements (e.g., potassium phosphate), sodium polystyrene sulfonate.Calcium carbonate can decrease the absorption of other drugs such as tetracycline antibiotics (e.g., doxycycline, minocycline), bisphosphonates (e.g., alendronate), estramustine, iron, levothyroxine, strontium, and quinolone antibiotics (e.g., ciprofloxacin, levofloxacin). Therefore, separate your doses of these medications as far as possible from your doses of calcium carbonate. Ask your doctor or pharmacist about how long you should wait between doses and for help finding a dosing schedule that will work with all your medications.Check the labels on all your prescription and nonprescription/herbal products (e.g., supplements, vitamins) because they may contain calcium. Ask your pharmacist about using those products safely.This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.

Report Problems to the Food and Drug Administration   You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088. Need help identifying pills and medications? Use the pill identifier tool on RxList.