Pharm: Upper Resp Flashcards
common cold comes from what virus
rhinovirus
rhinovirus causes what
acute inflammation of the nasal mucosa
acute rhinitis
competes with histamine for receptor sites and prevents a histamine response
antihistamines (block H1 receptor sites, decreasing secretions)
1st gen antihistamine side effects
drowsiness and dry mouth
dizziness, fatigue, blurred vision, disturbed coordination, urine retention
2nd gen antihistamine side effects
less drowsiness and less anticholinergic symptoms (block acetylcholine)
name a 1st gen antihistamine
Diphenhydramine
name a 2nd gen antihistamine
fexofenadine
primary goal when using antihistamines
less inflammation of nasal cavity and less secretions
contraindications with diphenhydramine
closed-angle glaucoma, urinary retention, severe liver disease
what is the interaction that can occur on diphenhydramine??
increase CNS depression with alcohol and other CNS depressants like opiates
(stop breathing/drop BP)
what is the major concern with diphenhydramine
sedation (warn pt to avoid driving and dangerous activities)
avoid alcohol
what do we give with oral diphenhydramine to decrease GI upset?
food
what can be used to relieve dry mouth on diphenhydramine?
sugarless candy, gum, or ice chips
onset and duration of diphenhydramine (PO)
onset- 15 min
duration- 4-7hrs
dose 25mg q6h
dilation of nasal blood vessels and swelling of nasal cavity
nasal congestion