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1 st  Generation * Anticholinergic (non-selective) * Highly sedative Less sedating Cetirizine* Somnolence(%) Cetirizine   13.7 Placebo  6.3 *Zyrtec Prescribing Information Potentially sedative/ cardiotoxic ? Loratadine Potential blockage of  K +  channels 2 nd  Generation Cetirizine, Loratadine,Fexofenadine Non-sedating Loratadine, Fexofenadine Fexofenadine  *Non- cardiotoxic *No anticholinergic side effects *Wide therapeutic index Antihistamines 3rd Generation !! Desloratadine * *Anticholinergic side  effects Levocetirizine * *Profile similar to cetirizine  *Somnolence 4 times that  of placebo *Xyzal Prescribing Information *Ellis et al, AAAAI 2002 H1 Antihistamines: Generation Concept
Antihistamines Comparogram OK OK OK OK OK Very good Palatability esp. in children No Data? No Yes Yes No Loss of efficacy over time (Tachyphylaxis) Yes No Yes No No Yes Clinical data for usage across age groups > 40 No/ Yes Some data No Yes Yes No No No Levo Reported+/- No Yes Yes No Anti-cholinergic side effects >125 No/ Yes Some data No Yes Yes No No Ctzn > 100 Yes No No Yes Yes Yes No Hydxyz > 100 Yes (Warning) No No Yes Yes Yes No Pmthz ,[object Object],> 125 Available in how many countries Yes Yes Approved by US FDA Some data Yes Significantly improves QOL of the child No Yes Wide therapeutic index Yes No Special label precaution for driving or operating heavy machinery Yes No Dosage adjustment required (renal or  hepatic impairment) Reported+/- No Problems of drug interactions/ QTc prolongation No Yes Genuinely non sedating (even at higher doses) DCL Allegra Criteria
Shamsi Z, et al. Hum Psychopharmacol 2000; 15 (suppl 1): S3-S30  Welch MJ, et al. H1-Antihistamines in Allergic Disease, 2nd ed, 2002;337  HD = higher than recommended dose; +/- = exhibits effects Antihistamines: Side effects & Impairment 0 0 0 Fexofenadine +/-,+(HD) 0 +/-,+(HD) Cetrizine 0,+(HD) +/- 0,+(HD) Desloratadine 0,+(HD) 0 0,+(HD) Loratadine +++ +++ +++ Clemastine ++ +++ ++ Brompheniramine ++ +++ ++ Chlorpheniramine +++ +++ +++ Diphenhydramine Impairment Anticholinergic effect Drowsiness

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Antihistamines Comparogram

  • 1. 1 st Generation * Anticholinergic (non-selective) * Highly sedative Less sedating Cetirizine* Somnolence(%) Cetirizine 13.7 Placebo 6.3 *Zyrtec Prescribing Information Potentially sedative/ cardiotoxic ? Loratadine Potential blockage of K + channels 2 nd Generation Cetirizine, Loratadine,Fexofenadine Non-sedating Loratadine, Fexofenadine Fexofenadine *Non- cardiotoxic *No anticholinergic side effects *Wide therapeutic index Antihistamines 3rd Generation !! Desloratadine * *Anticholinergic side effects Levocetirizine * *Profile similar to cetirizine *Somnolence 4 times that of placebo *Xyzal Prescribing Information *Ellis et al, AAAAI 2002 H1 Antihistamines: Generation Concept
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  • 3. Shamsi Z, et al. Hum Psychopharmacol 2000; 15 (suppl 1): S3-S30 Welch MJ, et al. H1-Antihistamines in Allergic Disease, 2nd ed, 2002;337 HD = higher than recommended dose; +/- = exhibits effects Antihistamines: Side effects & Impairment 0 0 0 Fexofenadine +/-,+(HD) 0 +/-,+(HD) Cetrizine 0,+(HD) +/- 0,+(HD) Desloratadine 0,+(HD) 0 0,+(HD) Loratadine +++ +++ +++ Clemastine ++ +++ ++ Brompheniramine ++ +++ ++ Chlorpheniramine +++ +++ +++ Diphenhydramine Impairment Anticholinergic effect Drowsiness