antihistamines Flashcards
histamine 1
contract smooth muscle
dilate capillaries
histamine 2 does what in anaphylaxis
increases HR a lot
increases all secretions
histamine 2
increase HR
increase gastric acid secretion
traditional/first gen sedation antihistamines
cross into CNS
indications for antihistamines
allergies/ reactions/ rhinitis
common cold
PD to decrease secretions
vertigo/ motion sickness
sleep aid
urticaria
pre-tx
histamine 1 contracts smooth muscles where in anaphylaxis
stomach and lungs
antihistamine properties
antihistamines
anticholinergics
sedation
second gen sedating antihistamines
remain in PNS
SE of antihistamines
drowsiness
visual changes
paradoxical excitement in children
drying effect
dry mouth/urinaryr etention/constipation
avoid taking antihistamines with…
alcohol
other OTC meds
erythromycin
antifungals
use antihistamines cautiously with …
COPD
IIOP
PUD
Seizures
HTN
BPH
asthma
Pregnancy
4 traditional first gen antihistamines are…
diphenhydramine- allergies
dimenhydrinate- motion
meclizine- vertigo
promethazine- nausea
second gen antihistamines
fexofenadine
loratadine
levocetirizine
