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Last reviewed on RxList: 4/12/2017
Phoslo Side Effects Center

Last reviewed on RxList 12/22/2016

Phoslo (calcium acetate) Tablet is a calcium supplement used to control the level of phosphate in the blood for patients on dialysis due to severe kidney disease. Phoslo is available in generic form. Common side effects of Phoslo include:

Tell your doctor immediately if you have unlikely but serious side effects of Phoslo including:

A serious allergic reaction to Phoslo is unlikely, but seek immediate medical attention if you have symptoms including rash, itching or swelling (especially of the face/tongue/throat), severe dizziness, and trouble breathing.

The recommended dosage of Phoslo is 2 tablets with each meal. Cipro, Declomycin, Oracea, Levaquin, Dynacin, Floxin, tetracyclines, and antacids may interact with Phoslo. Tell your doctor all medications you take. Before taking Phoslo talk to your doctor about your dietary calcium intake. If you are pregnant only take Phoslo if clearly needed. Talk to your doctor about taking Phoslo if you are breastfeeding.

Our Phoslo (calcium acetate) Tablet Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Phoslo Consumer Information

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Less serious side effects are more likely to occur, such as:

  • nausea, vomiting, loss of appetite;
  • constipation;
  • dry mouth or increased thirst; or
  • urinating more than usual.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Phoslo (Calcium Acetate Tablet)

Phoslo Professional Information


In clinical studies, patients have occasionally experienced nausea during PhosLo (calcium acetate tablet) therapy. Hypercalcemia may occur during treatment with PhosLo (calcium acetate tablet) . Mild hypercalcemia (Ca>10.5mg/dL) may be asymptomatic or manifest itself as constipation, anorexia, nausea and vomiting. More severe hypercalcemia (Ca>12mg/dl) is associated with confusion, delirium, stupor and coma. Mild hypercalcemia is easily controlled by reducing the PhosLo (calcium acetate tablet) dose or temporarily discontinuing therapy. Severe hypercalcemia can be treated by acute hemodialysis and discontinuing PhosLo (calcium acetate tablet) therapy. Decreasing dialysate calcium concentration could reduce the incidence and severity of PhosLo (calcium acetate tablet) induced hypercalcemia. The long-term effect of PhosLo (calcium acetate tablet) on the progression of vascular or soft-tissue calcification has not been determined.

Isolated cases of pruritus have been reported which may represent allergic reactions.

Read the entire FDA prescribing information for Phoslo (Calcium Acetate Tablet)

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© Phoslo Patient Information is supplied by Cerner Multum, Inc. and Phoslo Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.

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