Note: This document contains side effect information about calcium phosphate, tribasic. Some dosage forms listed on this page may not apply to the brand name Posture.

Applies to calcium phosphate, tribasic: oral tablet.

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

Stop using calcium phosphate and call your doctor at once if you have:

• severe nausea, vomiting, or constipation; or

• high blood calcium--confusion, tiredness, loss of appetite, increased thirst or urination, weight loss; or

• symptoms of a kidney stone--severe pain in your side or lower back, blood in your urine, painful urination.

Less serious side effects of calcium phosphate, tribasic (the active ingredient contained in Posture) may include:

• nausea, stomach bloating;

• constipation; or

• gas.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

For Healthcare Professionals

Applies to calcium phosphate, tribasic: oral tablet.

Gastrointestinal

Gastrointestinal side effects have included nausea in up to 9% of patients receiving calcium phosphate with vitamin D and fluoride.^[Ref]

Metabolic

Metabolic side effects have included hyperphosphatemia and hypercalciuria. Hypercalcemia has been reported with some calcium salts; however, it has not yet been associated with the use of calcium phosphate.^[Ref]

Metabolic changes associated with some calcium salts include hypercalcemia, although this has not yet been associated with the use of calcium phosphate.

Hyperphosphatemia can result from overuse.

Prolonged calcium administration of some calcium salts has rarely resulted in hypercalciuria. This may be more likely in patients with hypoparathyroidism who are receiving vitamin D.^[Ref]

Cardiovascular

Cardiovascular side effects have included a single case report of systemic tricalcium phosphate crystallosis involving the heart (myocarditis and pericarditis).^[Ref]