RCP PHARM midterm Flashcards
Pharmacology
study of drugs, including the origins, properties, and interactions with living organisms
Pharmacogenetics
the study of interrelationship of genetic differences and drug effects
Pharmacognosy
the identification of sources of drugs, from plants and animals
Toxicology
the study of toxic substances and their pharmacologic actions, including antidotes and poison control
Therapeutics
the art of treating diseases with drugs
Generic drug name
name assigned (by US adopted name council) when the chemical appears to have therapeutic use and the manufacturer wishes to market the drug (nonproprietary name)
Chemical name
name indicating the drug’s chemical structure
Official name
in the event that an experimental drug becomes fully approved for general use and is admitted to US Pharmacopeia-National Formulary, the generic name becomes the official name
Trade name
brand name of proprietary name, given by particular manufacturer
Thyroid hormone, insulin, pancreatic dornase drug source
Animal
Khellin (Ammi visnaga), Atropine (belladonna alkaloid), Digitalis (foxglove), Reserpine, Volatile oils of eucalyptus, pine, anise drug source
Plant
Copper sulfate, Magnesium sulfate (Epsom salts), Mineral oil (liquid hydrocarbons) drug source
Mineral
Generic drug difference
any manufacturer’s version of the prescribed drug and not a specific brand (cheaper)
Illegal drugs difference
controlled substances not prescribed by pharmacist nor bought at drug store
Over the counter (OTC) drugs difference
does not require a prescription for purchase, strength and amount per dose is less and may encourage “self-treatment” that could mask or complicated a serious medical condition
What drugs can be aerosolized?
- adrenergic
- anticholinergic
- mucoactive
- corticosteroid
- antiasthmatic
- antiinfective
- surfactants
Enternal route of adminstration
=refers to small intestine, intended for absorption anywhere along the GI tract (most common by mouth)
- Tablet, capsule, suppository, elixir, suspension
Parental route of administration
=injectable
- IV (Intravenous [IV]) → directly into vein
- IM (Intramuscular [IM]) → deep into skeletal muscle
- SC (Subcutaneous [Subcu, SubQ]) → subcutaneous tissue beneath epidermis and dermis
- IT (Intrathecal) [arachnoid membrane of the spinal cord] → diffuses in spinal fluid
- IO (Intraosseous [IO]) → marrow of bones
Transdermal route of administration
= application to skin
- Patch, paste
Inhalation route of administraton
= local (respiratory tract) or systemic effect
- Gas, aerosol
Topical route of administration
= applied directly to skin or mucous membranes to produce local effect
- Powder, lotion, ointment
Factors affecting drug absorption
Barriers can affect the drug’s time to onset and time to peak effect:
-bioavailability is influenced by absorption and by inactivation caused by stomach acids and by metabolic degradation (can occur before drug reaches main systemic compartment)
-blood flow to site absorption
Drug metabolism
=drug molecules are metabolized or bio-transformed, constitute a complex area of biochemistry
- liver
Biotransformation
= refers to the process by which lipophilic (fat-soluble), xenobiotic (foreign), or endobiotic (endogenous) chemicals are converted in the body by enzymatic reactions to products that are more hydrophilic (water-soluble)
First-Pass effect
= If a drug is highly metabolized by the liver enzymes and is administered orally, most of the drug’s activity is terminated in its passage through the liver before it ever reaches the general circulation and the rest of the body (…the concentration of a drug is greatly reduced before it reaches the systemic circulation)
Drug excretion (elimination)
=measure of the ability of the body to rid itself of the drug
- kidneys
Maintenace dose
= To achieve a steady level of drug in the body, dosing must equal the rate of administration.
Plasma Half-Life (T ½)
= The time required for the plasma concentration of a drug to decrease by one-half; a measure of how quickly a drug is eliminated from the body
Local drug effects
=topical deposited agent, inhaled aerosol strictly affects the upper or lower airways
- exemplified by a nasally inhaled vasoconstricting agent (decongestant) or by an inhaled bronchodilator aerosol
Systemic drug effects
= inhaled aerosol for the drug to be absorbed and distributed in the blood
- exemplified by the administration of inhaled zanamivir (Relenza) to treat influenza, inhaled morphine for pain control, or inhaled insulin aerosol for systemic control of diabetes
Penetration of drugs reaching respiratory tract
= Referring to the depth within the lung reached by particles
- 50%-60% of the drugs impacts the mouth or oropharynx
- 90% reaching the stomach
- 10%-30% being delivered to lower respiratory tract (depending on delivery device)
- Newer aerosol-generating devices are proving efficiency of 30% to 50% (more of the dose)
Efficiency of drugs reaching respiratory tract
= perfectly efficient inhalation device would deliver all the drugs to the luing and none to the oropharynx or GI tract
L/T ratio
= Proportion of drug available from the lung, out of the total systemically available drug
L/T ratio formula
(Lung dose) / (lung dose + GI dose)
- higher the ratio, the more efficient the aerosol drug delivery to the respiratory tract
Deposition of drugs reaching respiratory tract
= Describing the process by which particles deposit out of suspension to remain in the lung
- An increase in mean residence time or tidal volume enhances drug deposition in lungs, while an increase in air flow decreases the mean residence time, resulting in the decrease of total deposition of drug particles
Gravitational settling of drugs reaching respiratory tract
= Functional size and time of particle in the last five to six generations of airways (smaller bronchi and bronchioles), where air velocity is low
- use of a “breath hold” can increase settling of particles
Tolerance
= decreasing intensity of response to drug over time
Hypersensitivity
= allergy or immune-mediated reaction to a drug, which can be serious, requiring airway maintenance or ventilatory assistance
Tachyphylaxis
= rapid decrease in responsiveness to a drug
Agonist
= a drug or chemical that binds to a corresponding receptor (has affinity) and “initiates” a cellular effect or response (has efficacy)