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Important Note

The following information is intended to supplement, not substitute for, the expertise and judgment of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. Consult your healthcare professional before using this drug.


COMMON BRAND NAME(S): Citracal + D, Os-Cal, Oyster Shell + D


Calcium plays a critical role in the body. It is essential for normal functioning of nerves, cells, muscle and bone. Vitamin D improves the absorption of calcium into the body. Calcium supplements are used to treat or prevent low blood calcium levels. Calcium may be prescribed for treatment of osteoporosis (bone loss), osteomalacia (brittle bones), rickets, tetany, parathyroid disease. Calcium supplements are often used to ensure an adequate dietary intake in conditions such as pregnancy, nursing, kidney disease, pancreatitis or during therapy with anti-seizure medications.

How To Use

Take this medication orally as directed. It is best taken with or just after a meal to improve absorption. Take each dose with a full glass of water.

Side Effects

This medication is generally well tolerated. Constipation may occur. Notify your doctor if you experience: nausea, vomiting, stomach cramps, dry mouth, increased thirst, increased urination. If you notice other effects not listed above, contact your doctor or pharmacist.


Tell your doctor if you have: heart problems, kidney stones, allergies (especially drug allergies). This medication should be used as directed during pregnancy or while breast-feeding.

Drug Interactions

Tell your doctor of any over-the-counter or prescription medication you may take, especially of: digoxin. Avoid taking any tetracycline antibiotic within 1 to 2 hours of taking calcium since calcium may interfere with the absorption of tetracycline. Do not start or stop any medicine without doctor or pharmacist approval.


If overdose is suspected, contact your local poison control center or emergency room immediately. Symptoms of overdose may include nausea and vomiting, severe drowsiness, dry mouth, loss of appetite, metallic taste, stomach cramps, unconsciousness, diarrhea, weakness, headache, constipation, dizziness, or irritability.


Calcium supplements are available in different forms which vary in the amount of calcium they contain. Ask your doctor or pharmacist to help select the best product for you. Follow any dietary guidelines recommended.

Missed Dose

If you miss a dose, take it as soon as remembered; if it is near the time for the next dose, take both the missed dose and the regular scheduled dose then resume your usual dosing schedule.


Store tablets and capsules at room temperature between 59 and 86 degrees F (15 to 30 degrees C) away from heat and light. Do not store in the bathroom.