Skip to content
Drugs & Medications

lanthanum

COMMON BRAND NAME(S): Fosrenol

GENERIC NAME(S): LANTHANUM CARBONATE

Uses

Lanthanum is used to prevent high blood phosphate levels in patients who are on dialysis due to severe kidney disease. Dialysis removes some phosphate from your blood, but it is difficult to remove enough to keep your phosphate levels balanced. Decreasing blood phosphate levels can help keep your bones strong, prevent unsafe buildup of minerals in your body, and possibly decrease the risk of heart disease and strokes that can result from high phosphate levels. Lanthanum is a natural mineral that works by holding onto phosphate from the diet so that it can pass out of your body.

How to use lanthanum

Read the Medication Guide provided by your pharmacist before you start taking lanthanum carbonate and each time you get a refill. If you have any questions regarding the information, consult your doctor or pharmacist.

Take this medication by mouth with or right after each meal, or as directed by your doctor. This medication must be chewed thoroughly before swallowing to reduce the risk of stomach/abdominal side effects. You may crush the tablets to make it easier to chew them. Do not swallow tablets whole. It is not necessary to swallow this medication with water.

Use this medication regularly in order to get the most benefit from it. Remember to take it after each meal every day, or on the schedule given to you by your doctor. Dosage is based on your medical condition and response to therapy.

Lanthanum may interfere with the absorption of certain other medications taken by mouth (such as warfarin, drugs that interact with antacids). The manufacturer recommends taking these other medications at least 2 hours apart from lanthanum. Talk to your pharmacist for more details (see also the Drug Interactions section).

Side Effects

Nausea, vomiting, stomach pain, dizziness, diarrhea or constipation may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor right away if any of these serious side effects occur: mental/mood changes, unusual muscle weakness.

Infrequently, serious blockage of the bowels may occur, which may sometimes require surgery or going to the hospital. This can occur especially in people with stomach/abdominal problems (such as abdominal surgery, colon cancer, chronic constipation, slow gut syndrome). Tell your doctor right away if you have severe or persistent stomach/abdominal pain, severe constipation, or persistent vomiting.

A very serious allergic reaction to this drug is unlikely, but get medical help right away if it occurs. Symptoms of a serious allergic reaction may include: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Precautions

See also Side Effects section.

Before taking lanthanum, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: stomach/intestinal problems (e.g., ulcers, bowel blockage), mineral imbalance (low level of phosphate in the blood), problems chewing tablets.

This drug may make you dizzy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages.

Before having an X-ray of your stomach, be sure to tell X-ray lab personnel that you are taking this medication.

This medication is not recommended for children because of possible effects on the bones.

This medication is not recommended for use during pregnancy. Consult your doctor for more details.

It is not known whether this drug passes into breast milk. Consult your doctor before breast-feeding.

Interactions

Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Some products that may interact with this drug include: warfarin.

Because this drug is similar to some antacids, lanthanum may interfere with the absorption of certain drugs in the same way as antacids. Consult your pharmacist for details because you may need to separate taking lanthanum by at least 2 hours from any of the following medications, among others: certain azole antifungals (itraconazole, ketoconazole), certain cephalosporin antibiotics (cefaclor, cefdinir, cefpodoxime), gabapentin, HIV medications (e.g., atazanavir, delavirdine), levothyroxine, mycophenolate, tetracyclines.

Lanthanum may also interfere with the full absorption of other medications (such as quinolone antibiotics including ciprofloxacin/levofloxacin). Talk with your doctor or pharmacist about how to schedule lanthanum and your other medications to prevent this problem.

Overdose

If overdose is suspected, contact a poison control center or emergency room immediately. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center.

Notes

Your doctor may direct you to follow a special diet to help lower your blood phosphate levels. Follow the diet closely.

Do not share this medication with others.

Laboratory and/or medical tests (e.g., blood phosphate and calcium levels) should be performed regularly to monitor your progress or check for side effects. Consult your doctor for more details.

Missed Dose

If you miss a dose, skip the missed dose unless you have just eaten. If it is near the time of the next dose, skip the missed dose and resume your usual dosing schedule. Do not double the dose to catch up.

Storage

Store at room temperature at 77 degrees F (25 degrees C) away from light and moisture. Brief storage between 59-86 degrees F (15-30 degrees C) is permitted. Do not store in the bathroom. Keep all medicines away from children and pets.

Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company for more details about how to safely discard your product.

Information last revised November 2013. Copyright(c) 2013 First Databank, Inc.

Images

FOSRENOL 500 MG TABLET CHEW
FOSRENOL 500 MG TABLET CHEW
View Larger Picture
color
No data.
shape
No data.
imprint
No data.
FOSRENOL 750 MG TABLET CHEW
FOSRENOL 750 MG TABLET CHEW
View Larger Picture
color
No data.
shape
No data.
imprint
No data.
FOSRENOL 1,000 MG TABLET CHEW
FOSRENOL 1,000 MG TABLET CHEW
View Larger Picture
color
No data.
shape
No data.
imprint
No data.
FOSRENOL 500 MG TABLET CHEW
FOSRENOL 500 MG TABLET CHEW

Identification

color
No data.
shape
No data.
imprint
No data.
This medicine is a white, round chewable tablet imprinted with "S405 500".
FOSRENOL 750 MG TABLET CHEW
FOSRENOL 750 MG TABLET CHEW

Identification

color
No data.
shape
No data.
imprint
No data.
This medicine is a white, round chewable tablet imprinted with "S405 750".
FOSRENOL 1,000 MG TABLET CHEW
FOSRENOL 1,000 MG TABLET CHEW

Identification

color
No data.
shape
No data.
imprint
No data.
This medicine is a white, round chewable tablet imprinted with "S405 1000".

Add to Cabinet

Add Adderall to my medicine cabinet.

Did you know?

With WebMD's Medicine Cabinet, you can check interactions with drugs.

Go to medicine cabinet

Selected from data included with permission and copyrighted by First Databank, Inc. This copyrighted material has been downloaded from a licensed data provider and is not for distribution, expect as may be authorized by the applicable terms of use.

CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.

More about Drugs and Medications

Newsletters

Subscribe to free WebMD newsletters.

  • WebMD Daily

    WebMD Daily

    Subscribe to the WebMD Daily, and you'll get today's top health news and trending topics, and the latest and best information from WebMD.

  • Men's Health

    Men's Health

    Subscribe to the Men's Health newsletter for the latest on disease prevention, fitness, sex, nutrition, and more from WebMD.

  • Women's Health

    Women's Health

    Subscribe to the Women's Health newsletter for the latest on disease prevention, fitness, sex, diet, anti-aging, and more from WebMD.

By clicking Submit, I agree to the WebMD Terms & Conditions & Privacy Policy

URAC: Accredited Health Web Site TRUSTe online privacy certification HONcode Seal AdChoices