"The U.S. Food and Drug Administration today approved Xofigo (radium Ra 223 dichloride) to treat men with symptomatic late-stage (metastatic) castration-resistant prostate cancer that has spread to bones but not to other organs. It is intended for"...
(Generic versions may still be available.)
In the single study of Plenaxis™ conducted in men with advanced symptomatic prostate cancer, adverse events reported by ≥ 10% of patients are listed in Table 4. Adverse events are listed without regard to causality. Causality is often difficult to assess in elderly patients with multiple co-morbidities and prostate cancer.
Table 4: Adverse Events in ≥ 10% of Patients in the Advanced
Symptomatic Prostate Cancer Study (without regard for causality).
|Hot flushes*||64 (79)|
|Sleep disturbance*||36 (44)|
|Breast enlargement*||24 (30)|
|Breast pain/nipple tenderness*||16 (20)|
|Back pain||14 (17)|
|Peripheral edema||12 (15)|
|Upper respiratory tract infection||10 (12)|
|Micturition frequency||8 (10)|
|Urinary retention||8 (10)|
|Urinary tract infection||8 (10)|
|* Pharmacological consequence of androgen deprivation|
Changes in Laboratory Values
Clinically meaningful increases in serum transaminases were seen in a small percentage of patients in both treatment groups in each active-controlled Plenaxis™ study. In Study 1 and Study 2 combined, the percentage of Plenaxis™ patients reporting serum ALT > 2.5 times upper limit of normal or > 200 U./L was 8.2% and 1.8%, respectively. The percentage reporting serum AST > 2.5 times upper limit of normal or > 200 U/L was 3.1% and 0.8%, respectively. Similar results were reported for active comparators.
Slight decrease in hemoglobin, a pharmacological consequence of castration, were observed in patients receiving Plenaxis™ and active comparator. Mean increases in serum triglycerides of approximately 10% were seen in Plenaxis™ -treated patients.
Read the Plenaxis (abarelix) Side Effects Center for a complete guide to possible side effects
No formal drug/drug interaction studies with Plenaxis™ were performed. Cytochrome P-450 is not known to be involved in the metabolism of Plenaxis™ . Plenaxis™ is highly bound to plasma proteins (96 to 99%).
Response to Plenaxis™ should be monitored by measuring serum total testosterone concentrations just prior to administration on Day 29 and every 8 weeks thereafter (see WARNINGS). Serum transaminase levels should be obtained before starting treatment with Plenaxis™ and periodically during treatment. Periodic measurement of serum PSA levels may also be considered.
Last reviewed on RxList: 5/26/2011
This monograph has been modified to include the generic and brand name in many instances.
Additional Plenaxis Information
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You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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