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Drug Safety-related Labeling Changes (SrLC)

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QUADRAMET (NDA-020570)

(SAMARIUM SM-153 LEXIDRONAM PENTASODIUM)

Safety-related Labeling Changes Approved by FDA Center for Drug Evaluation and Research (CDER)

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09/21/2017 (SUPPL-8)

Approved Drug Label (PDF)

5 Warnings and Precautions

PRECAUTIONS

(additions underlined)

  1. EDTMP is a chelating agent. Although the chelating effects have not been evaluated thoroughly in humans, dogs that received non-radioactive samarium EDTMP (6 times the human dose based on body weight, 3 times based on surface area) developed a variety of electrocardiographic (ECG) changes (with or without the presence of hypocalcemia). The causal relationship between the hypocalcemia and ECG changes has not been studied. Whether QUADRAMET® causes electrocardiographic changes or arrhythmias in humans has not been studied. Caution and appropriate monitoring should be given when administering QUADRAMET® to patients (See Laboratory Tests).

  2. Because concomitant hydration is recommended to promote the urinary excretion of QUADRAMET®, appropriate monitoring and consideration of additional supportive treatment should be used in patients with a history of congestive heart failure or renal insufficiency.

  3. Renal Impairment: Because approximately one third of Samarium Sm-153 EDTMP is excreted in the urine, clearance may be reduced in patients with renal impairment; it is not known if dose adjustment is needed.