Burosumab-twza injection is used to treat X-linked hypophosphatemia (XLH; a rare, inherited form of rickets that causes poor bone growth and development) in adults and children one years of age and older. Burosumab-twza injection is in a class of medications called fibroblast growth factor 23 (FGF23) blocking antibodies. It works by blocking the action of a certain natural substance in the body which causes the symptoms of XLH.
Burosumab-twza injection comes as a solution (liquid) to be injected subcutaneously (under the skin) by a doctor or nurse. It is usually injected once every 2 weeks for children 17 years of age and younger, and once every 4 weeks for adults. Your doctor or nurse will inject the medication in either your upper arm, upper thigh, buttocks, or stomach area, and use a different injection site each time.
Tell your doctor if you are taking any phosphate supplements or certain vitamin D supplements such as calcitriol (Rocaltrol) or paricalcitol (Zemplar). You will need to stop taking these 1 week before you start treatment.
Your doctor may increase your dose (not more than once every 4 weeks), or may skip a dose, depending on the results of your lab tests.
This medication may be prescribed for other uses; ask your doctor or pharmacist for more information.
Before using burosumab-twza injection,
Unless your doctor tells you otherwise, continue your normal diet.
If you miss an appointment to receive a dose, make another appointment as soon as possible.
Burosumab-twza injection may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:
Some side effects can be serious. If you experience any of these symptoms, call your doctor:
Burosumab-twza injection may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.
If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online ( Web Site ) or by phone (1-800-332-1088).
Keep all appointments with your doctor and the laboratory. Your doctor will order certain lab tests before and during your treatment to check your body's response to burosumab-twza injection.
It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.
AHFS® Consumer Medication Information. © Copyright, The American Society of Health-System Pharmacists, Inc., 7272 Wisconsin Avenue, Bethesda, Maryland. All Rights Reserved. Duplication for commercial use must be authorized by ASHP.
Selected Revisions: July 15, 2018.