Multiple Drug Allergies

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1 Management of Patients with Multiple Drug Allergies Roland Solensky, MD, FAAAAI The Corvallis Clinic Corvallis, OR

2 Conflict of Interest Financial: None Research: Merck, AllerQuest Legal Consult/Expert Witness: Antibiotic allergies Organizational: None Gifts: None

3 Definition Multiple Drug Allergy Syndrome (MDAS) hypersensitivity to 2 or more structurally unrelated medications propensity to make immune responses to haptens and then express a broad range of immunopathologic responses, rather than a propensity to react in specific ways to specific classes of drugs * * Sullivan TJ. Drug Allergy. Allergy: Principles and Practice pp

4 Case History 61 Y/O female: Age 18: anaphylaxis to IM penicillin Age 28: rash on PO cephalexin Age 30: rash on PO TMP/SMX Age 51: urticaria on PO ciprofloxacin Age 58: pruritic M-P rash, day 2 of PO azithromycin Age 59: cutaneous pruritus, nausea, day 1 of PO doxycycline

5 MDAS: Evaluation and Management Evaluation History Skin testing Challenges Management Goal = open 2 classes of Plan for each antibiotic Avoid antibiotics for future use Severe non-ige allergies (SJS, TEN, etc.) Defer evaluation b/c unlikely to need antibiotic OK to use (after negative challenge) Give only via induction of drug tolerance (desensitization)

6 MDAS: Evaluation and Management cont Evaluate penicillin allergy first Natural history known Skin testing validated Clinically useful Evaluate other antibiotic classes depending on clinical usefulness and likelihood of need More useful: Cephalosporins Quinolones Macrolides Less useful: Tetracyclines Sulfonamides Clindamycin Aminoglycosides

7 MDAS: Skin Testing with Non-penicillins Skin testing using non-irritating concentrations of native antibiotics may be useful, but is not validated Relevant break-down products/metabolites unknown Positive result suggestss presence of drug-specific IgE antibodies Negative result does not rule out IgE-mediated allergy

8 Antibiotic Allergy History Name of the antibiotic When during course did reaction occur Characteristics of reaction Previous exposure to same or similar antibiotic Reason for administrationn Concurrent medications at time of reaction Management required for reaction Time elapsed since the reaction Subsequent exposure to same or similar antibiotic Similar symptoms in absence of antibiotic treatment Khan DA, Solensky R. J Allergy Clin Immunol 2010; 115:S

9 Macrolides (I) 73 consecutive pediatric patients referred for suspected clarithromycin allergy (Florence, Italy) Urticaria (62%), angioedema (18%), M-P rash (19%) Immediate (27%), delayedd (67%), undetermined (6%) All patients underwent skin testing with IV clarithromycin 64/73 patients underwent clarithromycin challenges, irrespective of skin test results (9 refused) 5 days (7.5 mg/kg bid) Initial dose single blindedd Initial dose given via 4 step graded challenge (1/100, 1/10, 2/10, 7/10) Mori F, et al. Ann Allergy Asthma Immunol 2010; 104:417-9.

10 Macrolides (I) 4 reactions: 2 immediate (urticaria, urticaria/ae) 2 delayed (M-P rashes on days 3 & 4) Mori F, et al. Ann Allergy Asthma Immunol 2010; 104:417-9.

11 Skin Test Positive Macrolides (I) Challenge Positive 3 6 Skin Test 1 54 Negative Sensitivity = 75% Specificity = 90% PPV = 33% NPV = 98% Mori F, et al. Ann Allergy Asthma Immunol 2010; 104: Challenge Negative

12 Macrolides (II) 107 patients (24/83 M/F) referred to academic allergy clinic for suspected macrolide allergy (Montpellier, France) Skin testing with macrolide in 33/107 patients (up to 10mg/cc ID) All patients underwent challenges: Same macrolide associated with historical reaction Single blinded (? placebo) Dosing: Starting with 1 mg, 6 total doses up to full dose Doses given Q 30 min Benahmed S, et al. Allergy 2004; 59:

13 PPV = 36% NPV = 82% Sens = 50% Spec = 72% Positive macrolide skin test 4/8 7/25

14 Macrolides (III) 125 consecutive patients (33/92 M/F) referred to allergy clinic for suspected macrolide allergy (Germany) 53 Immediate reactors (79% urticaria/angioedema, 21% anaphylaxis) 72 Delayed reactors Prick and ID skin testing (0.01 mg/ml) immediate reactors Patch testing delayed reactors 113/125 patients underwent macrolide challenges Same macrolide associated with historical reaction 3-4 step graded challenge dose starting with 10-20% of the full Seitz CS, et al. Allergol Immunopathol (Madr) 2011; 39:193-9.

15 Seitz CS, et al. Allergol Immunopathol (Madr) 2011; 39:193-9.

16 Seitz CS, et al. Allergol Immunopathol (Madr) 2011; 39:193-9.

17 Quinolones 101 consecutive patients (20/81 M/F) referred for history of allergic reactions to quinolones (Germany) 64 immediate reactors (53% urticaria/angioedema, 47% anaphylaxis) 37 delayed reactors Prick skin testing (no ID te esting) in immediate reactors (2-5 mg/ml) Patch testing in delayed reactors Irritant potential of skin test not evaluated in negative controls Most patients underwent graded oral challenges Seitz CS, et al. Clin Exp Allergy 2009; 39:

18 Seitz CS, et al. Clin Exp Allergy 2009; 39:

19 Seitz CS, et al. Clin Exp Allergy 2009; 39:

20 Quinolone Allergy Natural History of IgE-mediatedd Reactions 55 patients with history of immediate reactions to quinolones (1-48 months before evaluation) 30/55 patients (54.5%) positive serum IgE (RIA) to culprit quinolone Among 30 IgE-positive patients Recent rx s (< 8 months): average % bound radioactivity = 14.4% Distant rx s (> 8 months): average % bound radioactivity = 8.1% Average time lapse between reaction and evaluation 9.7 months (IgE-positive group) 15.6 months (IgE-negative group) Manfredi M, et al. J Allergy Clin Immunol 2004; 113:

21 Quinolone Allergy Cross-reactivity for IgE-mediatedd Reactions 24/30 patients (80%) showed positive serum IgE (RIA) to culprit quinolone and 1 other quinolone 1 21/28 patients (71%) showed positive serum IgE (RIA) or positive BAT to culprit quinolone and 1 other quinolone 2 Most smaller case series confirm high degree of allergic cross-reactivity among quinolones via in vitro testing or challenges Manfredi M, et al. JACI 2004; 113: Aranda A, et al. Allergy 2011; 66: Anovadiya AP, et al. J Pharmacol Pharmacother 2011; 2: Gonzalez I, et al. J Invest Allergol Clin Immunol 2005; 15: Ronnau AC, et al Acta Derm Venereal (Stockh) 1997; 77: Davila I, et al. Allergy 1993; 48:

22 Case History 61 Y/O female: Age 21: anaphylaxis to IM penicillin Age 28: rash on PO cephalexin Age 30: rash on PO TMP/SMX Age 51: urticaria on PO ciprofloxacin Age 58: pruritic M-P rash, day 2 of PO azithromycin Age 59: cutaneous pruritus, nausea, day 1 of PO doxycycline

23 Case History Follow Up Penicillin skin test (Pre-Pen, penicillin G) negative amoxicillin 1-step oral challenge negative Cefazolin (33 mg/ml), cefuroxime (10 mg/ml) and ceftriaxone (10 mg g/ml) skin tests negative 2-step cephalexin oral graded challenge negative Levofloxacin (0.025 mg/ml) skin test negative 2-step oral graded challenge negative

24 Case History Follow Up Azithromycin (0.01 mg/ /ml) skin test negative 2-step oral graded challenge? positive (pruritus, nausea) single-blinded challenge negative Doxycycline defer ev valuation Sulfanomides defer evaluation

25 Cephalosporin Non-irritating Skin Test Concentrations in Non-allergic Control Subjects IV Cephalosporin Full Strength Concentrationn (mg/ml) Cefazolin 330 Cefuroxime 100 Cefotaxime 100 Ceftriaxone 100 Ceftazidime 100 Highest Nonirritating Concentration Dilution from Full Strength 33 mg/ml 1:10 10 mg/ml 1:10 10 mg/ml 1:10 10 mg/ml 1:10 10 mg/ml 1:10 Empedrad RB, et al. J Allergy Clin Immunol 2003; 112:

26 Other Antibiotics Non-irritating Skin Test Conc IV Antibiotic Full Strength Conc (mg/ml) Highest Nonirritating Conc Dilution from Full Strength Tobramycin 40 Ticarcillin 200 Clindamycin 150 Gentamycin 40 Trimethoprim-sulfa 80 (sulfa) Levofloxacin 25 Erythromycin 50 Nafcillin 250 Vancomycin 50 Azithromycin 100 Clarithromycin 50 4 mg/ml 1:10 20 mg/ml 1:10 15 mg/ml 1:10 4 mg/ml 1: mg/ml 1: mg/ml 1:1, mg/ml 1:1, mg/ml 1:10, mg/ml 1:10, mg/ml 1:10, mg/ml 1:1,000 Data from Empedrad RB, et al. J Allergy Clin Immunol 2003; 112:629-30, except clarithromycin (Mori F, et al. Ann Allergy Asthma Immunol 2010; 104:417-9.)

27 Summary Focus MDAS evaluation on the most clinically useful antibiotics Penicillins, cephalosporins, quinolones, macrolides Consider skin testing with non-penicillins Graded oral challenges essential Most patients presenting with history of allergy to quinolones and macrolides are able to tolerate them

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