Erythromycin side effects
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Phone:617-632-7753
List of Side effects
QT syndrome
Hepatic Dysfunction
Congenital Syphilis
Rhabdomyolysis
Pseudomembranous Colitis
Overgrowth of Clostridia
QT syndrome
There have been reports of prolonged QT syndrome in geriatric patients receiving oral
erythromycin products. Return to top
Hepatic Dysfunction
There have been reports of hepatic dysfunction, with or without jaundice, occurring in
patients receiving oral erythromycin products. Return to top
Congenital Syphilis
There have been reports suggesting that erythromycin does not reach the fetus in
adequate concentration to prevent congenital syphilis. Infants born to women treated
during pregnancy with oral erythromycin for early syphilis should be treated with an
appropriate penicillin regimen. Return to top
Rhabdomyolysis
Rhabdomyolysis with or without renal impairment has been reported in seriously ill
patients receiving erythromycin concomitantly with lovastatin. Therefore, patients
receiving concomitant lovastatin and erythromycin should be carefully monitored for
creatine kinase (CK) and serum transaminase levels. Return to top
Pseudomembranous Colitis
Pseudomembranous colitis has been reported with nearly all antibacterial agents,
including erythromycin, and may range in severity from mild to life-threatening.
Therefore, it is important to consider this diagnosis in patients who present with
diarrhea subsequent to the administration of antibacterial agents. Return to top
Overgrowth of Clostridia
Treatment with antibacterial agents alters the normal flora of the colon and may permit
overgrowth of clostridia. Studies indicate that a toxin produced by Clostridium difficile is
one primary cause of “antibiotic-associated colitis”. Return to top
The content of this page is taken from the FDA package insert for this drug and should not be edited.
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .

