HISTAMINE, 5HT, DOPAMINE MEDS Flashcards
Where are H1, H2, H3, H4 receptors located?
“tidine”
Cimetidine
Ranitidine
Nizatidine
Famotidine
H2 Receptor acid reducer (another use for second gen antihistamine)
Fexofenadine
H2 Receptor Antag/ Second Gen Anti-histamine
ALLEGRA
Loratadine
H2 Receptor Antag/ Second Gen Anti-histamine
Claritin
Certirizine
H2 Receptor Antag/ Second Gen Anti-histamine
Zyrtec
What do you know about H1 Receptor Antagonist/ First Generation Anti-histamines?
Organ effects of Histamines
CNS?
Heart?
Stomach?
Lungs?
Triple Response (Wheal & Flare)
CNS: H1/ H3—- pain/itch
<3: Vasodilation (Decrease BP) and Reflex tachycardia (increase HR)
Stomach: More stomach fluid produced, Diarrhea induced + GI contractions (move more food/fluid along)
Lungs: Bronchoconstriction
TRIPLE REPONSE / Wheal and Flare
1. REDNESS – microcirculation smooth muscle becomes leaky redness
2. FLUID—Capillary endothelium leady fluid rush in
3. FLARE— Sensory nerve endings flare up
Recall the major indications for 1st generation antihistamines, and contrast 1st and 2nd generation antihistamine.
Uses of the H2 antihistamines, contrast PPIs
Serotonin Effects on the Body
CNS?
Resp?
CV?
GI?
Nervous system
-Melatonin precursor
-Vomiting reflex
-Pain and itch (similar to histamine)
– Chemoreceptor reflex
* Bradycardia
* Hypotension
Respiratory
– SEROTONIN Facilitate ACh release – constriction—
– Hyperventilation
CV
– Contraction of vascular SM
* Exception: skeletal muscle, heart (relax)
– Platelet aggregation
GI
– Increases tone MORE TONE = MORE MOVEMENT
– Facilitates peristalsis
– Overproduction – diarrhea
List the source of serotonin and main 5-HT agonist targets
Sumatriptan
Describe the action and indication for the use of sumatriptan.
Constrict brain vessels. Migraine caused by brain vessels dilating
List the three categories of hyperthermia disorders, contributing factors, and treatments.
Two main 5-HT antagonist targets, and drugs in each category.
Dopamine Pathways:
1.) Nigrostriatal
2.) Mesolimbic
3.) Mesocortical
Major Dopamine Pathways:
1.) Nigrostriatal—Motor Movement
2.) Mesolimbic– **Reinforcement/Addiction
3.) Mesocortical—Working memory/planning
Compare and contrast preventatives and treatments for migraine headache
Migraine Prevention
1. Beta-blockers, CCBs, ACEi
2. Antidepressants – SSRIs, TCAs
3. Anti-seizure – Valproate, Topiramate
4. Botox
5. MAbs - Aimovig– blocks CGRP (protein that causes inflammation and vasodilation in brain)
Ergotamine
Class of medications called ergot alkaloids. It works together with caffeine by preventing blood vessels in the head from expanding and causing headaches.
AKA: For migraine, not as effective as Triptans (5Htr Agonist)
Chlorpromazine
Anti-nausea – For migraine treatment
You can also use Ondansetron
5-HT1D/1B Agonist
Uses? Drugs? Major side effects?
Dex (Fenfluramine)
Lorcaserin
5 HT2C agonist- WITHDRAWN 2020
Liraglutide
These are non-serotonin weight loss drugs)
-Liraglutide: GLP-1 Agonist (DM)
-Orlistat: GI Lipase Inhibitor
Orlistat
These are non-serotonin weight loss drugs
-Liraglutide: GLP-1 Agonist (DM)
-Orlistat: GI Lipase Inhibitor
Phenoxybenzamine
Cyproheptadine
Used for?
Ondansetron (Zofran)
Dopamine
How is it made?
What is the reuptake transporter?
How many receptor types?
Main pathway for reinforce behavior?
Major Dopamine Pathways:
1.) Nigrostriatal—Motor Movement
2.) Mesolimbic– **Reinforcement/Addiction
3.) Mesocortical—Working memory/planning
Biosynthesis: Tyrosine** –> LDOPA-> DA
DAT, D1-D5
Where in the brain is does the dopamine pathway start?
Where do each of these work?
Fluoxetine (Prozac)*
Citalopram (Celexa)
not on study guide
Paroxetine (Paxil)
Not on study guide
Sertraline (Zoloft)*
Escitalopram (Lexapro)
Desvenlafaxine (Pristique) **
Duloxetine (Cymbalta)