Antihistamines/Decongestants. Flashcards
What is Is a chemical created in the body. Produce vasodilation of arterioles and increased permeability of
capillaries and venule, which allows fluid to escape into the surrounding tissue
resulting in localized swelling.
Histamine
Highest amount of histamine is found in _____ and _____
basophils (WBC) and mast cells
1st generation antihistamines VS
2nd generation antihistamines
1st gen has increased side effects such as drowsiness since they cross the blood brain barrier.
2nd gen has fewer CNS side effects
H¹ - antihistamines work by binding to histamine H¹ receptors in mast cells,
smooth muscle, and endothelium in the body as well as in the in the brain in
order to prevent the release of histamine. They suppress the histamine-induced
______ and ______
wheal response (swelling) and flare response (vasodilation)
H¹- antihistamines are used to _______
treat allergic reactions
Can H¹- antihistamines also be used to treat insomnia, motion sickness, or vertigo
yes
H² - antihistamines bind to histamine H² receptors in the upper gastrointestinal
tract, primarily in the stomach.
Antihistamines that target the histamine H²
receptor are used to treat ________________
gastric acid conditions
Patients taking 1st generation antihistamines should be counseled to not operate ______, ______ or ______ while taking these medications
weapons, heavy machinery or motor vehicles
1st Generation or 2nd Generation
1) Diphenhydramine: Benadryl,
2) Hydroxyzine: Atarax
3) Promethazine: Phenergan
1st Generation
1st Generation or 2nd Generation
1) Cetirizine HCL: Zyrtec
2) Fexofenadine: Allegra
3) Loratadine: Claritin
2nd Generation
When a first-generation antihistamine is indicated for a pregnant women what one may be used?
Diphenhydramine
What medication is used for
-Reduce swelling of nasal passages
-Enhance drainage of sinuses
Decongestant
The active ingredients in most ingested decongestants are __________ or ________.
Pseudoephedrine
Phenylephrine
What class would you use for common cold, hay fever or upper respiratory allergies, sinus congestion, and
pressure.
- Antihistamines
- Decongestant
Decongestant
Contraindications for what class?
(a) Use with caution in hypertension, DMII, and increased intraocular pressure.
(b) May worsen prostatic hyperplasia/urinary obstruction.
(c) Elderly may be more sensitive
(d) Pregnancy CAT C. Not recommended for use in pregnancy.
(e) Overuse of topical can cause rebound nasal congestion.
(f) Typically paired with an antihistamine.
Decongestants