Diphenhydramine (Benadryl)

Question 1

Benadryl Classification

Answer 1

Antihistamine, sedative

Question 2

Benadryl Action

Answer 2

antihistamine that possesses anticholinergic, antiemetic, and sedative effects

Question 3

Benadryl Onset and Duration

Answer 3

1. IV - immediate
   IM - unknown
2. 6-8 hrs

Question 4

Benadryl Indication

Answer 4

1. Antihistamine
   a. anaphylaxis use as adjunct with epi
   b. uncomplicated allergic reaction
2. Dystonic reaction or extrapyramidal reactions to phenothiazines

Question 5

Benadryl Contraindication

Answer 5

Asthma

Question 6

Benadryl Caution

Answer 6

1. Has Atropine-like action

2. Pts with asthma, hypotension, OB, glaucoma

Question 7

Benadryl Dosage and Administration

Answer 7

Adult: 25-50mg IV/IO or deep IM: Max dose 100mg
Pediatric: 1-2mg/kg IM, slowly IV/IO, max dose 50mg

Question 8

Benadryl Adverse Reaction

Answer 8

1. Sedation, dizzy, disturbed coordination, dry mouth, thick bronchial secretions, hypotension, palpitations, tacky or bradycardia, blurred vision

Question 9

Benadryl Reference in Protocol

Answer 9

Shock (anaphylactic)
Medical (od)
Environmental (Allergic)