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Antihistamines

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Question
Answer
Antihistamines inhibit:   Histamines  
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What is the major usage of antihistamines?   Dermatology and allergies  
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Where is histamine released from?   Mast Cells  
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What is pruritus?   Itchiness  
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What is a common allergic reaction?   pruritus  
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Other than pruritus, what are 2 other adverse reactions seen with histamine release?   hypotension and contriction of bronchioles  
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T/F - Antihistamines are anti-inflammatories.   True  
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T/F - Antihistamines counteract histamines.   False - they are a preventative and do not counteract  
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What is the major use of antihistamines in canines?   atopy (allergies)  
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T/F - Antihistamines should be the first drug of choice.   True  
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Clinical uses for antihistamines:   pruritis (itching), urticaria (hives), laminitis, motion sickness, anaphylactic shock, reverse sneexe syndrome, heaves (equine asthma), feline asthma and upper respiratory tract infections  
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The most common side effect of antihistamines is:   sedation or lethargy  
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What are some other side effects associated with antihistamine use:   CNS excitation, birth defects (teratogenicity), anti-cholinergic action, rare agranulocytosis  
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What is a major contraindication with antihistamine use?   Anticonvulsant drugs (phenobarbitol)  
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Diphenhydramine/Benadryl(R): Forms   Most common, forms include oral caps and elixirs and injectables  
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Chlorpheniramine/Chor-trimetron(R)   Common, not as effective for skin problems  
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Hydroxyzine/Atarax(R)   Causes relaxation of skeletal muscles, less side effects than classic antihistamines, tab form, some analgesic effect  
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Dimenhydrinate/Dramamine(R)   antiemetic  
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Pyrilamine Maleate/Histavet(R)   Heaves in horses, LA, Granule form  
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Pramoxine/Relief(R)   shampoos  
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Cyproheptadine   side effect: PP, not first choice of antihistamine  
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