Chapters 1-3 & 5-7 Flashcards
Adverse Effect
General term for undesirable and potentially harmful drug effect
Chemical Name
Name that defines the chemical composition of a drug
Agonist
Drug that binds to a receptor and activates a physiologic response or drug action
Contraindications
Situations or conditions when a certain drug should not be administered
Antagonist
drug that binds to a receptor and interferes with other drugs or substances from producing a drug effect
Dose
A measurement of the amount of drug that is administered
Drug
Chemical substance that produces a change in the body function
Drug Indications
intended or indicated uses for any drug
ED50
Effective dose 50, or dose that will produce an effect that is half of the maximal response
Generic Name
Nonproprietary name of a drug
controlled substance
drug that has the potential for abuse and thus is regulated by law
LD50
Lethal dose 50, or a dose that will kill 50 percent of the laboratory animals tested
Mechanism of Action
Explanation of how a drug produces its effects
Nonprescription, over the counter (OTC) drug
Drug that can be purchased without the services of a physician
Pharmacology
Study of drugs
Receptor
Specific cellular structure that a drug binds to in order to produce a physiologic effect
Side Effect
Drug effect other than the therapeutic effect that is usually undesirable but not harmful
Site of action
Location within the body where a drug exerts it therapeutic effect, often a specific drug receptor
Therapeutic effect
Desired drug effect to alleviate some condition or symptom of disease
Therapeutic index (TI)
Ration of the LD50 to the ED50 in animal studies
Toxic effect
Undesirable drug effect that implies drug poisoning can be very harmful of life-threatening
Trade Name
Patented proprietary name of a drug sold by a specific drug manufacturer; also referred to as the brand name
What are the Major areas of Pharmacology? (6)
Pharmacodynamics Pharmacokinetics Pharmacotherapeutics Pharmacy Posology Toxicology
Pharmacodynamics
Study of the action of drugs on living tissue
Pharmacokinetics
Study of the processes of drug absorption, distribution, metabolism, and excretion
Pharmacotherapeutics
Study of the use of drugs in treating disease
Pharmacy
Science of preparing and dispensing medicines
Posology
Study of the amount of drug that is required to produce therapeutic effects
Toxicology
Study of the harmful effects of drugs on living tissue
Duration of action
Length of time that a drug continues to produce its effect.
Time-Plasma Drug Concentration or Time response Curve
The relationship of time and the plasma drug concentration
The US Pharmacopoeia/National Formulary (USP/NF)
Official drug list recognized by the US government
The Physicians’ Desk Reference (PDR)
Reference most widely used by physicians, pharmacist, and nurses for info relating to the use of drugs in the practice of medicine
Schedule I (Drugs)
Drugs with high abuse potential and no accepted medical use
Ex- heroin, hallucinogens, marijuana (not to be prescribed)
Schedule II (Drugs)
Drugs with high abuse potential and accepted medical use
Ex- narcotics (morphine and pure codeine) cocaine, amphetamines, short-acting barbiturates (amobarbital, secobarbital), nabilone. No refills without a new written prescription from the physician
Schedule III (Drugs)
Drugs with moderate abuse potential and accepted medical use
Ex- moderate- and intermediate-acting barbiturates Dronabinol, anabolic steroids, preparations containing codeine plus another drug: prescription required, may be refilled five times in 6 months when authorized by the physician
Schedule IV (Drugs)
Drugs with low abuse potential and accepted medical use
Ex- phenobarbital, chloral hydrate, zolpidem (Ambien), anti anxiety drugs (Librium, Valium) prescription required, may be refilled five times in 6 months when authorized by the physician
Schedule V (Drugs)
Drugs with limited abuse potential and accepted medical use
Ex- Narcotic drugs used in limited quantities for antitussive (codeine) and antidiarrheal purposes (diphenoxylate, Lomotil) drugs can be sold only by a registered pharmacist buyer must be 18 years old and show identification. Some states require a prescription for schedule V drugs
Bio-availability
Percentage of the drug dosage that is absorbed
Drug absorption
Entrance of a drug into the bloodstream from its site of administration
Drug addiction
Condition of drug abuse and drug dependence that is characterized by compulsive drug behavior
Drug dependence
Condition of reliance on the use of particular drug, characterized by physical and or psychological dependence
Drug distribution
Passage of a drug from the blood to the tissues and organs of the body
Drug metabolism
The enzymatic bio transformation of the drug into metabolites
Drug excretion
Elimination of the drug from the body
Drug microsomal metabolizing system (DMMS)
Group of enzymes located primarily in the liver that function to metabolize (bio transformation) drugs.
Drug tolerance
Decreased drug effect occurring after repeated drug administration
Enzyme induction
Increase in the amount of drug metabolizing enzymes after repeated administration of certain drugs
Enzyme inhibition
Inhibition of drug-metabolizing enzymes by certain drugs
First- pass metabolism
Drug metabolism that occurs in the intestines and liver during oral absorption of drugs into the systemic circulation
Half-life
Time required for the body to reduce the amount of drug in the plasma by one-half.
Individual variation
Difference in the effects of drugs and drug dosages from one person to another
Intramuscular injection (IM)
Route of drug administration – drug is injected into gluteal or deltoid muscles.
Muscle
Intravenous injection (IV)
Route of drug administration drug is injected into a vein
Loading dose
Initial drug dose administered to rapidly achieve therapeutic drug concentrations
Maintenance dose
Dose administered to maintain drug levels in blood in the therapeutic range
Oral administration
Route of drug administration that does not involve the gastrointestinal (GI) tract
Alcoholic Preparations (Drug Form)
Elixirs, spirits,tincutres, and fluid extracts are drugs dissolved in various concentrations of alcohol, usually in the range of 5-20 percent
Aqueous Preparations (Drug Form)
Syrups (a solution of water and sugar to which a drug is added)
Powders (Drug Form)
Powders are drugs or drug extracts that are dried and ground into fine particles
Tablets
Drug powders that have been compressed into a convenient form for swallowing. Usually disintegrate in the stomach more rapidly than most other solid preparations
Troches and Lozenges (Drug Form)
Flattened tablets are allowed to dissolve in the mouth; commonly used for colds and sore throats
Capsules (Drug Form)
Gelatin capsules are used to administer drug powders or liquids; dissolve in the stomach thereby releasing the drug
Delayed- Release Products (Drug Form)
Usually tablets or capsules that are treated with special coatings to that various portions of the drug will dissolve at different rates. Usually contain the equivalent of two or three single dose units. Designed to produce drug effects over extended time
Enteric- Coated Products (Drug Form)
Drug tablet or capsule coated with an acid-resistant substance that will dissolve only in less acidic portions of the intestines. Should be take on an empty stomach with water, either 1 hour before or 2 hours after meals.
Suppositories (Drug Form)
Drugs mixed with a substance (cacao butter) that will melt at body temperature. Are intended for insertion into the rectum, urethra, or vagina.
Ointments (Drug Form)
Or salves are soft, oily substances (petrolatum or lanolin) containing a drug that applied to the skin or in the case of ophthalmic ointments to the eye
Transdermal Products (Drug Form)
Administered through a bandage or patch system. Released from the bandage or patch and is then absorbed through the skin into the systemic circulation. Provides continuous source of drug of 24 hours or more Nitroglycerin estrogen and clonidine are drugs available in this form
Parental Injection (Drug Forms)
Involves the administration fo drugs by needle and syringe Different injection sites such ad subcutaneous (SC) intramuscular (IM) intravenous (IV) and others provide different rates of drug absorption and onset of action. Requires the practice of sterile technique and various safety precautions
Oral Administration (PO) (Routes of Administration)
Safest and most convenient method
30-60 min before significant absorption from the GI tract occurs, therefore the onset of the drug action is delayed
Can be removed (if need be) within the first few hours
Parenteral Administration Include?
Routes of Administration
Any route that does not involve the GI tract, including inhalation, hypodermic injection and topical application.
Intramuscular injection (IM)
Intravenous injection (IV)
Inhalation
Topical Application
Ex- most medications – aspirin, sedatives, hypnotics, antibiotics
Sublingual (Routes of Administration)
Takes several Minutes
Buccal (Routes of Administration)
Several minutes
Convenient dosage from for certain drugs
Ex- nitroglycerin in angina pectoris
Rectal (Routes of Administration)
15 to 30 min
When a patient cannot take oral medications and parenteral is no indicated, also for local effects
Ex- analgesics, laxatives