Fosrenol Side Effects

Generic Name: lanthanum carbonate

Note: This page contains information about the side effects of lanthanum carbonate. Some of the dosage forms included on this document may not apply to the brand name Fosrenol.

Not all side effects for Fosrenol may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

For the Consumer

Applies to lanthanum carbonate: oral tablet chewable

Along with its needed effects, lanthanum carbonate (the active ingredient contained in Fosrenol) 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 lanthanum carbonate:

More common
  • Dialysis graft blockage
Incidence not known
  • Bone pain
  • convulsions
  • difficulty having a bowel movement (stool)
  • itching skin
  • loss of appetite
  • skin rash
  • trouble breathing
  • unusual tiredness or weakness

Some side effects of lanthanum carbonate 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
  • nausea
  • runny nose
  • sneezing
  • stomach pain
  • stuffy nose
  • vomiting
Incidence not known
  • Acid or sour stomach
  • belching
  • heartburn
  • indigestion
  • stomach discomfort or upset
  • tooth injury

For Healthcare Professionals

Applies to lanthanum carbonate: oral tablet chewable


Gastrointestinal side effects (including nausea, vomiting, and diarrhea) were the most prominent reasons for discontinuation of therapy in clinical studies.

One study reported incidence of nausea and vomiting as high as 16% and 18%, respectively.

Gastrointestinal side effects have frequently included nausea (11%, compared to 5% with placebo), vomiting (9%, compared to 4% with placebo), abdominal pain (5%, compared to 0% with placebo), diarrhea (13% to 23%), and constipation (6% to 14%). Postmarketing gastrointestinal side effects have included dyspepsia.


Cardiovascular side effects have included hypotension (8% to 16%).


Respiratory side effects have included bronchitis (5%) and rhinitis (5% to 7%).


Other side effects have included dialysis graft complication (3% to 26%), headache (5% to 21%), and dialysis graft occlusion (4% to 21%). Other side effects reported postmarketing have included tooth injury.


Metabolic side effects have included hypercalcemia (up to 4%). Metabolic side effects reported postmarketing have included hypophosphatemia and hypocalcemia (up to 5%).


Dermatologic side effects reported postmarketing have included allergic skin reactions.

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