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©2013 UpToDate ® Print Email Nonirritating concentrations for skin testing with common antibiotics Antimicrobial drug Full-strength concentration Nonirritating concentration Cefotaxime 100 mg/mL 10 -1 Cefuroxime 100 mg/mL 10 -1 Cefazolin 330 mg/mL 10 -1 Ceftazidime 100 mg/mL 10 -1 Ceftriaxone 100 mg/mL 10 -1 Tobramycin 80 mg/2 mL 10 -1 Ticarcillin 200 mg/mL 10 -1 Clindamycin 150 mg/mL 10 -1 Gentamicin 40 mg/mL 10 -1 Cotrimoxazole 80 mg/mL 10 -2 Levofloxacin 25 mg/mL 10 -3 Erythromycin 50 mg/mL 10 -3 Azithromycin 100 mg/mL 10 -4 Nafcillin 250 mg/mL 10 -4 Vancomycin 50 mg/mL 10 -4 Nonirritating concentrations are expressed as dilutions from the full-strength intravenous preparation Reproduced from: Empedrad, R, Darter, A, Earl, H, Gruchalla, R. Letters to the Editor. Nonirritating intradermal skin test concentrations for commonly prescribed antibiotics. J Allergy Clin Immunol 2009; 112:629. Illustration used with the permission of Elsevier Inc. All rights reserved.