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General pharmacology
Introduction to common drugs
47
Pharmacology
Undergraduate 2
02/26/2011

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Term
Chemical name
Definition
scientific name, describes atomic, molecular structure
Term
Generic name
Definition
non-proprietary name
Term
Trade (brand, proprietary) name
Definition
selected by drug company, copyright protected
Term
1962, Federal government mandated use of one official name per drug
Listed in:
United States Pharmacopeia
National Formulary
Definition
Generic Name
Term
Pharmacologic class
Definition
groups drugs with similar characteristics
Term
Therapeutic class
Definition
groups drugs by therapeutic use
Term
natural sources
Definition
Plants, Animals, Minerals
Term
Minerals
Definition
Metallic, non-metallic [iron, iodine, Epsom salts]
Term
Animals
Definition
Hormones [insulin], oils [cod liver oil], enzymes [pancreatin, pepsin], vaccines [micro-organisms]
Term
Plants
Definition
Alkaloids [caffeine, nicotine], glycosides [digoxin], gums [seaweed extractions], resins, oils [peppermint, castor oil]
Term
synthetically made in laboratory
Definition
Isolate and intensify active component
Manipulate molecular structure
Term
Drug Administration
Definition
Method influences the
Quantity given
Absorption rate
Distribution in body
Term
PO
Definition
Oral (PO): patient conscious, can swallow; drug withstands stomach acids
Term
Sublingual:
Definition
into capillary bed under tongue
Term
Buccal
Definition
in pouch between cheek and gum
Term
Translingual:
Definition
on the tongue
Term
PR
Definition
Rectal (PR), vaginal: suppositories, ointments, creams, gels
Term
Inhalation
Definition
gases rapidly absorbed; metered-dose inhaler
Term
Topical
Definition
local delivery through skin, mucous membrane [dermatologic, ophthalmic, nasal preparations]
Term
Transdermal
Definition
“patch” applied to skin, drug enters blood through capillaries
Term
Transdermal
Definition
“patch” applied to skin, drug enters blood through capillaries
Term
Gastric
Definition
directly into GI system, patient can’t ingest orally
Term
Intradermal
Definition
: injected into skin (dermis)
Term
IV
Definition
* Intravenous (IV): rapid onset, injected directly into blood
Term
IM
Definition
Intramuscular (IM): injected into muscle; drug enters blood through capillaries
Term
SC
Definition
Subcutaneous (SubQ, SC): injected into subcutaneous tissue; drug enters blood through capillaries
Term
IND
Definition
Investigational New Drug (IND): new drug application after animal studies prove safety, effectiveness
Term
Human Clinical Trials
Definition
Phase I: tested on healthy volunteers
Phase II: tested on people with specific disease
Phase III: more people, look for adverse effects
Phase IV: post-market surveillance; reports from doctors on therapeutic or adverse effects
Term
NDA
IND
Definition
New Drug Application (NDA): years later
Treatment Investigational New Drug (treatment IND): expedited approval due to public health threat [AIDS drugs]
Term
Pharmacokinetics
Definition
Study of what happens from time drug enters body until it, and all its metabolites, leave body:
Term
Absorption:
Definition
: rate drug leaves site of administration
Fast: seconds, minutes (sublingual, IV, inhalation)
Slow: (oral, IM, SC)
Slowest: hours, days (rectally, sustained-release)
Term
absorption influences
Definition
Influenced by: blood flow, stress, diet, drug formulation, drug-drug interaction
Term
First-pass effect: liver metabolizes drug
Oral drugs absorbed in small intestine - liver (first-pass effect)- circulated to rest of body
Definition
May inactivate/lower amount of active drug released into circulation
Necessitates higher oral drug dosage for desired effect
Term
Distribution factors
Drug delivery to site of action (body tissues, fluids)
Definition
Blood flow: faster to heart, liver, kidneys; slower to internal organs, skin, fat, muscle
Solubility: lipid-soluble cross cell membrane, blood-brain barrier; water-soluble don’t
Protein binding: bound part therapeutically inactive; free (unbound) portion active
Term
Metabolism
Definition
Body changes drug from dosage form to excretable water-soluble form:
Into inactive metabolites
Into active metabolites with own pharmacologic action
Term
Pro-drugs:
Definition
inactive drugs, become active after metabolized
Term
Excretion
Definition
Drug elimination from body:
Kidneys -urine
Lungs -exhalation
Exocrine glands -sweat, saliva, milk
Skin -sweat
Intestinal tract -feces
Term
Half Life
Definition
50% of drug in blood eliminated every ½ life
Helps determine dosage frequency
Term
Steady state:
Definition
Drug administration = drug excretion
Term
Onset of Action:
Definition
time interval from drug administration to therapeutic effect
Term
Peak concentration:
Definition
absorption rate = elimination rate
Term
Duration of action:
Definition
length of therapeutic effect
Term
Pharmacodynamics
Definition
Study of mechanism of drug action on biological system
Drug forms chemical bond with specific receptor sites on surface of cell
Term
Agonist drugs:
Definition
initiate cell response after binding cell receptor
Term
Antagonist drugs:
Definition
incomplete binding, prevents cell response
Term
Antagonist Competitive
Definition
: competes with agonist for receptor site; reversible binding
Term
Antagonist Non-competitive:
Definition
binds receptor, blocking agonist binding; irreversible binding
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