TITLE

Rhabdomyolysis associated with phentermine

AUTHOR(S)
Steidl, Kelly E.; Darko, William; Probst, Luke A.; Noviasky, John A.; Nasser, Samer
PUB. DATE
November 2010
SOURCE
American Journal of Health-System Pharmacy;11/15/2010, Vol. 67 Issue 22, p1929
SOURCE TYPE
Academic Journal
DOC. TYPE
Case Study
ABSTRACT
Purpose. A case of rhabdomyolysis associated with the use of phentermine is reported. Summary. A 32-year-old Caucasian man with a recent history of strenuous exercise sought treatment for significant back, shoulder, and radiating inguinal pain. The patient's home medications included the following, administered orally: esomeprazole, levothyroxine, irbesartan--hydrochlorothiazide, metoprolol succinate, metoclopramide, dicyclomine, oxycodone--acetaminophen, and oxycodone extended-release. He also used testosterone topical gel. During the hospital stay, it was discovered that the patient had been taking phentermine hydrochloride 37.5 mg twice daily, double the recommended dosage, for approximately one week before and on the day his symptoms started. His initial laboratory test values were as follows: troponin I, 17.46 ng/mL; creatine kinase (CK), 114,383 units/L; CK-MB, 745.5 ng/mL; and serum creatinine (SCr), 2.8 mg/dL. The patient was diagnosed with rhabdomyolysis of the left deltoid muscle, shoulder, posterior scapula, and upper thorax and with secondary acute renal failure. The patient's urine output was initially poor and rapidly declined to anuria on day 2 of admission. He received i.v. hydration with 0.45% sodium chloride at an initial rate of 200 mL/hr with 75 meq/L of sodium bicarbonate for urinary alkalinization. He did not require renal replacement therapy, and his urine output began to improve to 0.5 mL/kg/hr on hospital day 5 and was 1.42 mL/ kg/hr before discharge. Use of the Naranjo et al. adverse-event probability scale revealed that phentermine was the probable cause of the patient's rhabdomyolysis. Conclusion. A 32-year-old man developed rhabdomyolysis after ingesting double the recommended dosage of phentermine for a week in addition to engaging in strenuous activity.
ACCESSION #
55041252

 

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