Basic Pharmacology and Public Health Flashcards
Low Volume of distribution
COMPARTMENT & DRUG TYPES
Intravascular
Large/charged molecules; plasma protein-bound
Medium Volume of distribution
COMPARTMENT & DRUG TYPES
ECF
Small hydrophilic molecules
High Volume of distribution
COMPARTMENT & DRUG TYPES
All tissues including fat
Small lipophilic molecules, especially if bound to tissue protein
Types of drug interactions
Additive - EXAMPLE
Aspirin and acetaminophen
Types of drug interactions
Permissive - EXAMPLE
Cortisol on catecholamine responsiveness
Types of drug interactions
Synergistic - EXAMPLE
Clopidogrel with aspirin
Types of drug interactions
Tachyphylactic - EXAMPLE
An acute decrease in response to a drug after initial/repeated administration
P - phenylephrine L - LSD a N - Nitrates N - niacin e M' - MDMA
Drug metabolism - Phase I
Reduction, Oxidation, Hydrolysis with
cytochrome P-450
Geriatric patients lose phase I first.
R-OH
Drug metabolism - Phase II
Conjugation (Methylation, Glucuronidation, Acetylation, Sulfation) usually yields very polar, inactive metabolites (renally excreted).
conjugating MAGS
Therapeutic index
TITE: Therapeutic Index = TD50/ED50·
Drugs with lower TI values frequently require monitoring, for example…
Warfarin, Theophylline, Digoxin, Antiepileptic drugs, Lithium;
Warning! These Drugs Are Lethal!
Anticholinesterase poisoning - Muscarinic effects:
Diarrhea, Urination, Miosis, Bronchospasm, Bradycardia, Emesis, Lacrimation, Sweating, Salivation.
DUMBBELSS.
Reversed by atropine, a competitive inhibitor. Atropine can cross BBB to relieve CNS symptoms.
Anticholinesterase poisoning - Nicotinic effects
Neuromuscular blockade (a mechanism similar to succinylcholine). Reversed by pralidoxime, regenerates AChE if given early.
Pralidoxime (quaternary amine) does not readily cross BBB.
Anticholinesterase poisoning - CNS effects
Respiratory depression, lethargy, seizures, coma.
Atropine - ADVERSE EFFECTS
Side effects: Hot as a hare Dry as a bone Red as a beet Blind as a bat Mad as a hatter Full as a flask
Albuterol, salmeterol,terbutaline - ACTION
beta2 >beta1
Dobutamine- ACTION
beta1 > beta2, alfa
Dopamine- ACTION
D1 = D2 >beta > alfa
Epinephrine- ACTION
beta > a
Fenoldopam- ACTION
D1
lsoproterenol- ACTION
betaI = beta2
Midodrine- ACTION
a1
Mirabegron- ACTION
beta 3