Medication Guide App

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

As well as its needed effects, calcium acetate (the active ingredient contained in PhosLo Gelcap) may cause unwanted side effects that require medical attention.

If any of the following side effects occur while taking calcium acetate, check with your doctor immediately:

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 calcium acetate side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned 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.[Ref]


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

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.[Ref]


Metabolic side effects have included edema.


1. Dayton KD "Calcium acetate: a choice for phosphate management." ANNA J 23 (1996): 50-1

2. "Product Information. PhosLo (calcium acetate)" Braintree, Braintree, MA.

3. Holechek MJ "Medication review: an alternative phosphate binder--calcium acetate." ANNA J 18 (1991): 321-2

More about PhosLo Gelcap (calcium acetate)

Consumer resources

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