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Cal-Lac Side Effects

Generic name: calcium lactate

Note: This document contains side effect information about calcium lactate. Some dosage forms listed on this page may not apply to the brand name Cal-Lac.

Applies to calcium lactate: oral tablet.


Follow all directions on the label and package. Use exactly as directed.

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 lactate (the active ingredient contained in Cal-Lac) and call your doctor at once if you have:

Common side effects may include:

  • stomach pain, gas; or

  • constipation.

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 lactate: compounding powder, oral tablet.


Metabolic side effects have included hypercalcemia and hypercalciuria.[Ref]

When calcium is administered for prolonged periods, hypercalcemia and hypercalciuria may result. These conditions are more likely in patients with hypoparathyroidism who are also receiving large amounts of milk. Signs and symptoms of hypercalcemia include anorexia, nausea, vomiting, constipation, abdominal pain, dry mouth, and thirst.[Ref]


Genitourinary side effects have rarely included hypercalciuria and calcium nephrolithiasis.[Ref]

Prolonged administration of calcium salts can result in hypercalciuria and the development of calcium nephrolithiasis in some cases, particularly during coadministration of loop diuretics.[Ref]


Gastrointestinal side effects have been reported rarely. They have included nausea and constipation.[Ref]

More about Cal-Lac (calcium lactate)

Patient resources

Other brands


Related treatment guides


1. "Product Information. Calphosan (calcium lactate)." Glenwood Inc (2001):

2. Fordtran JS "Acid rebound." N Engl J Med 279 (1968): 900-5

3. Edelson GW, Kleerekoper M "Hypercalcemic crisis." Med Clin North Am 79 (1995): 79-92

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.