PhosLo Gelcap Side Effects

Generic Name: calcium acetate

Note: This page contains side effects data for the generic drug calcium acetate. It is possible that some of the dosage forms included below may not apply to the brand name PhosLo Gelcap.

It is possible that some side effects of PhosLo Gelcap may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.

For the Consumer

Applies to calcium acetate: oral capsule, oral solution, oral tablet

Along with its needed effects, calcium acetate (the active ingredient contained in PhosLo Gelcap) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking calcium acetate:

More common
  • Abdominal or stomach pain
  • confusion
  • constipation
  • depression
  • dry mouth
  • full or partial loss of consciousness
  • headache
  • incoherent speech
  • increased urination
  • loss of appetite
  • metallic taste
  • muscle weakness
  • nausea or vomiting
  • thirst
  • unusual tiredness
  • weight loss
Incidence not known
  • Swelling

Some side effects of calcium acetate may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common
  • Diarrhea
Less common
  • Itching
Incidence not known
  • Dizziness
  • weakness

For Healthcare Professionals

Applies to calcium acetate: compounding powder, injectable solution, oral capsule, oral liquid, oral tablet


Dermatologic side effects have included pruritus.


Gastrointestinal side effects associated with mild hypercalcemia (calcium levels greater than 10.5 mg/dl) have included constipation, anorexia, nausea and vomiting.

Nervous system

Nervous system side effects associated with severe hypercalcemia (calcium greater than 12 mg/dl) have included confusion, dizziness, weakness, delirium, stupor, and coma.


Metabolic side effects have included edema.

More about PhosLo Gelcap (calcium acetate)

Consumer resources

Professional resources

Other formulations

Related treatment guides

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