Autacoids
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| 2-methyl histamine | H1 receptor agonist
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| 2-pyridylethylamine | H1 receptor agonist
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| 2-thiazolyethylamine | H1 receptor agonist
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| 4(5)-methyl histamine | H2 receptor agonist
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| Dimaprit | H2 receptor agonist
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| Impromadine | H2 receptor agonist
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| (R)-a-methyl histamine | H3 receptor agonist (weak H4)
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| Clobenpropit | H3 receptor agonist (weak H4)
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| Diphenhydramine (benadryl) | 1st gen antihistamine; ethanolamine
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| Dimenhydrinate (dramamine) | 1st gen antihistamine; ethanolamine
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| Chlorpheniramine maleate (chlor-trimeton) | 1st gen antihistamine; alkylamine
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| Pyrilamine maleate (poly-histine-D) | 1st gen antihistamine; ethylenediamine
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| Cyclizine HCL (marezine) | 1st gen antihistamine; piperazine
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| Promethazine HCL (phenergan) | 1st gen antihistamine; phenothiazine
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| Phenindamine tartrate (nolahist) | 1st gen antihistamine; piperidine
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| Acrivastine (semprex-D) | 2nd gen antihistamine; alkylamine
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| Cetirizine HCL (zyrtec) | 2nd gen antihistamine; piperazine
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| Loratadine (claritin) | 2nd gen antihistamine; piperidine
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| Desloratadine (clarinex) | 2nd gen antihistamine; piperidine
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| Fexofenadine (allegra) | 2nd gen antihistamine; piperidine
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| Terfenadine | 2nd gen antihistamine; piperidine; WITHDRAWN from market d/t fatal arrhythmias
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| Cimetidine (tagamet) | H2 receptor antagonist
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| Ranitidine (zantac) | H2 receptor antagonist
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| Famotidine (pepcid) | H2 receptor antagonist
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| Nizatidine (axid) | H2 receptor antagonist
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| H1 Receptor Characteristics | Gq/11 (inc Ca, cAMP); smooth muscle, CNS, endothelial cells; 2-CH3-histamine agonist; chlorpheniramine antagonist
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| H2 Receptor Characteristics | Gs (inc cAMP); gastric parietal cells, cardiac muscles, extravascular smooth muscles; dimaprit agonist; ranitidine antagonist
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| H3 receptor Characteristics | Gi/o (dec cAMP); CNS, presynaptic myenteric plexus; (R)-a-CH2-Hist agonist; Thiperamide & clobenpropit antagonist
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| H4 receptor characteristics | Gi/o (dec cAMP, inc Ca); hematopoeitic cells; Clobenpropit agonist; thioperamide atagonist
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