Anti-histamine and Anti-emetics Flashcards
First generation antihistamines
antihistamines that cause a sedative side effect
Second generation antihistamines
More expensive and have been linked to heart problems, but do not have a sedative effect
Anti histamine - action
Inhibits the effects of histamine by antaganising the histamine receptors
First generation antihistamines - Chlopheniramine - example
Pirton
First generation antihistamines - Chlopheniramine - action
Binds to H1 receptor to prevent binding of histamine
Excreted in urine
First generation antihistamines - Chlopheniramine - uses
Allergies Anaphylactic reactions (after steroids and adrenaline) Mild anxiety in dogs and cats
First generation antihistamines - Chlopheniramine - side effects
Sedation
May reduce the seizure threshold
First generation antihistamines - Cyproheptadine - examples
Periactin
First generation antihistamines - Cyproheptadine - action
binds to H1 receptors and serotonin receptions to block acetycholine
First generation antihistamines - Cyproheptadine - uses
Allergic skin conditions
Appetite stimulant
First generation antihistamines - Cyproheptadine - side effects
Sedation
polyphagia
weight gain
may reduce seizure threshold
First generation antihistamines - Diphenhydramine - examples
Benadryl
First generation antihistamines - Diphenhydramine - action
binds to H1 receptors
excreted in the urine
First generation antihistamines - Diphenhydramine - uses
pruritus prevention of motion sickness allergic rhinitis in birds ferrets prior to vaccines if previous reaction Mild sedative
First generation antihistamines - Diphenhydramine - side effects
sedation
paradoxical excitement in cats
Liquid is unpleasant
Second generation antihistamines - Loratadine - examples
Clarityn
Second generation antihistamines - Loratadine - actions
binds to H1 receptors
excreted in faeces, urine and breast milk
Second generation antihistamines - Loratadine - uses
management of allergic disease
Second generation antihistamines - Loratadine - side effects
Drowsiness
May reduce seizure threshold
Second generation antihistamines - Cetirizine - examples
Zirtec
Second generation antihistamines - Cetirizine - action
Binds to H1 receptors
Excreted in urine
Second generation antihistamines - Cetirizine - uses
allergic symptoms
prevent early anaphylaxsis
may help eosinophillic disease in cats
Second generation antihistamines - Cetirizine - side effects
May reduce seizure threshold
contraindicated in patients with renal impairment
Anti-emetics - action
blocks vomiting receptors or neurotransmitters that stimulate them
Neurotransmitters that cause vomitting
Histamine Acetylcholine Serotonin (toxins and irritants) Dopamine Substance P (pain transmitter)
Antiemetics - ACP
Tranquilizer used as antiemtic for motion sickness
Blocks dopamine
Stops histamine released in response to stimulation of inner ear
Antiemetics - Benadryl
Decreased impulses sent from the vestibular apparatus within the inner ear
more effective in dogs than cats - dogs have more receptors
side effect - sedation
Antiemetics - Atropine
Decreased gut motility and intestinal secretions
can make vomiting worse
Antiemetics - metocloprimide
Blocks dopamine and serotonin receptors
More effective in dogs
Increases lower oesophageal muscle tone - reduces vomiting created by gastric stasis
side effects - sedation and frenzied behaviours in cats
Antiemetics - maropitant
inhibits vomiting by blocking neurokinin receptors
used to treat vomiting induced by motion sickness or chemotherapy
Plasma bound
Pain on injection (keep in fridge)
Side effects - V+ hypersalivation and lethargy
Antiemetics - Zofran
Antiemetic in chemotherapy
Serotonine antagonist