RT Book, Section A1 Williams, Saralyn R. A1 Thurman, R. Jason A2 Knoop, Kevin J. A2 Stack, Lawrence B. A2 Storrow, Alan B. A2 Thurman, R. Jason SR Print(0) ID 1177128778 T1 Vancomycin-Induced Red Man Syndrome T2 The Atlas of Emergency Medicine, 5e YR 2021 FD 2021 PB McGraw-Hill PP New York, NY SN 9781260134940 LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1177128778 RD 2021/01/24 AB Vancomycin has activity against gram-positive bacteria with little to no activity against gram-negative bacteria or mycobacteria. It is poorly absorbed after oral administration, although it may be used orally for treatment of pseudomembranous colitis. Intravenous administration is the most common route. This is well tolerated with minimal burning at the site of the intravenous line; however, rapid infusion may occasionally cause degranulation of mast cells and basophils. As a result, the patient experiences erythematous flushing, particularly of the face and neck, hence the name “red man syndrome.” Tachycardia and hypotension may occasionally be seen.