CHAPTER 3 Flashcards
DRUG VS MEDICINE
Any substance other than food which has a physiological effect when ingested or otherwise introduced into the body
DRUG
DRUG VS MEDICINE
A substance that is used in treating disease or relieving pain
MEDICINE
DRUG VS MEDICINE
Used for different purposes like treating disease, relieving pain, recreation & improving cognitive abilities
DRUG
DRUG VS MEDICINE
Mainly used to treat disease or relieve pain
MEDICINE
DRUG VS MEDICINE
May have either positive or negative effects
DRUG
DRUG VS MEDICINE
Usually has a positive effect on the health
MEDICINE
DRUG VS MEDICINE
Associated with negative connotations
DRUG
DRUG VS MEDICINE
Not associated with negative connotations
MEDICINE
the branch of pharmacology that uses drugs to treat, prevent, and diagnose disease.
CLINICAL PHARMACOLOGY
2 Key Concerns of CLINICAL PHARMACOLOGY
- The drug’s effects on the body (Pharmacodynamics)
- The body’s response to the drug (Pharmacokinetics)
The drug’s effects on the body
Pharmacodynamics
The body’s response to the drug
Pharmacokinetics
refers to all methods to be used for treatment of disease. In addition to drug therapy, this may include plans for special diets; use of hot packs, whirlpools, counselling, psychotherapy
THERAPEUTIC REGIMEN
SOURCES OF DRUGS
PLANTS
ANIMAL PRODUCTS
INORGANIC COMPOUNDS
SYNTHETIC SOURCES
are an important source of chemicals that are developed into drugs
Plants
are used to replace human chemicals that are not produced because of disease or genetic problems
Animal Products
Salts of various elements can have therapeutic effects in the human body
Inorganic Compounds
Drugs that are developed synthetically
Altered chemical with proven therapeutic effectiveness to make it better (more potent, more stable, less toxic)
Synthetic Sources
Identify which source of drug based on the example given:
Quinidine (for malaria)
Plants
Identify which source of drug based on the example given:
Insulin (from the pancreas of cows and pigs)
Animal Products
Identify which source of drug based on the example given:
Aluminum (Antacid), Flouride (dental cavities), Iron (Anemia)
Inorganic Compounds
The first synthetic Drug is ______, as a sedative hypnotic medication (induced sleep) and is still available today.
Chloral hydrate
A tablet or capsule taken by mouth goes through three phases:
Pharmaceutic
Pharmacokinetic
Pharmacodynamic
In the _______ phase, the drug becomes a solution so that it can cross the biologic membrane.
Pharmaceutic
There is no pharmaceutic phase when the drug is administered ______.
administered parenteraly by subcutaneous (subQ), intramuscular (IM), or intravenous (IV) routes
In the GI tract, drugs need to be in solution so they can be absorbed, a process known as ______.
dissolution
are fillers and inert substances used in drug preparation to allow the drug to take on a particular size and shape and to enhance drug dissolution.
Excipients
Some additives in drugs, such as the _______ and _______ or ________, increase the absorbability of the drug.
ions potassium; sodium in penicillin potassium or penicillin sodium
Drugs in _____ form are more rapidly available for GI absorption than are ____.
liquid; solids
Generally, drugs are both disintegrated and absorbed faster in _____ fluids with a pH of _ or _ rather than in _____ fluids.
acidic; 1 or 2; alkaline
Both the very young and older adults have less gastric acidity; therefore, drug absorption is generally _____ for those drugs absorbed primarily in the stomach.
slower
Stomach pH is __ to __ and the fluid of is __ – __ ml.
1.5 to 3.5; 20 – 100 ml
_____ are inactive substance used to make the active medicine easier to measure. Usually use in tablets and capsules
Fillers
The _______ phase, or what the body does to the drug, describes the movement of the drug through the body.
pharmacokinetic
4 processes of pharmacokinetics
Absorption
Distribution
Metabolism (biotransformation)
Excretion (elimination)
The _______ phase, or what the drug does to the body, involves receptor binding, postreceptor effects, and chemical reactions. A biologic or physiologic response results from this phase.
pharmacodynamic
is the movement of the drug into the bloodstream after administration.
Drug Absorption
Approximately __ of drugs are taken by mouth (enteral).
80%
For the body to use drugs taken by mouth, a drug in solid form (tablet or capsule) must disintegrate into small particles and combine with a liquid to form a solution, a process known as _______ (drugs in liquid form are already in solution), to be absorbed from the GI tract into the bloodstream.
dissolution
_____ are not 100% drug. Fillers and inert substances – such as simple syrup, vegetable gums, aromatic powder, honey, and various elixirs – called _______ are used in drug preparation to allow the drug to take on a particular size and shape and to enhance drug dissolution.
Tablets; excipients
is the breakdown of an oral drug into smaller particles.
Disintegration
is the time it takes the drug to disintegrate and dissolve to become available for the body to absorb it.
rate of dissolution
drugs resist disintegration in the gastric acid of the stomach, so disintegration does not occur until the drug reaches the alkaline environment of the small intestine.
Enteric-coated (EC)
EC tablets can remain in the stomach for a long time; therefore their effect may be ____ in onset.
delayed
_______ and _______ should not be crushed because crushing alters the place and time of absorption of the drug.
EC tablets or capsules and sustained-release (beaded) capsules
An example of EC tablets; it works stopping the production of certain natural substances that cause fever, pain, swelling and blood clots.
Aspirin
Drugs given ____ are absorbed slower than drugs administered by the oral route. Absorption is slower because the surface are in the rectum is _____ than the stomach, and it has _____. Additionally, the composition of the suppository base affects drug absorption.
rectally; smaller; no villi
After absorption of oral drugs from the GI tract, they pass from the intestinal lumen to the liver via the portal vein. In the liver, some drugs are metabolized to an inactive form and are excreted, thus reducing the amount of active drug available to exert a pharmacologic effect. This is referred to as _________.
first-pass metabolism
______ and ______, for example, are not given orally because they have extensive first-pass metabolism, and most of the drug is inactivated.
Lidocaine and some nitroglycerins
Drugs that are delivered by other routes (__, __, __, ____, ____, ______) do not enter the portal circulation and are not subjected to first-pass metabolism.
(IM, IV, SQ, nasal, sublingual, buccal)
refers to the percentage of administered drug available for activity.
Bioavailability
For orally administered drugs, bioavailability is affected by _____ and ________.
absorption and first-pass metabolism
The bioavailabilty of oral drugs is always ________ and varies based on the rate of first-pass metabolism.
less than 100%
The bioavailability of intravenous (IV) drugs is ____.
100%
Factors that alter bioavailability include the:
(1) drug form; (2) route of administration; (3) gastric mucosa and motility; (4) administration with nfood and other drugs; and (5) changes in liver metabolism
A decrease in liver function or a decrease in hepatic blood flow can _____ the bioavailability of a drug, but only if the drug is metabolized by the liver.
increase
is the movement of the drug from the circulation to body tissues.
Distribution
Drugs are easily distributed in ______ such as the liver, heart, and kidney. Tissues with decreased perfusion, such as muscle, fat, and peripheral organs, result in ______.
highly perfused organs; decreased drug distribution
can be defined as the extent or fraction to which a drug binds to receptors at any given drug concentration or the firmness with which the drug binds to the receptor.
AFFINITY
describes the maximum response that can be achieved with a drug.
EFFICACY
Blood vessels in the brain have a special endothelial lining where the cells are pressed tightly together (tight junctions); this lining is referred to as the ______.
blood-brain barrier(BBB)
The BBB protects the brain from _______, which includes about __ of the drugs on the market. Some drugs that are highly lipid soluble and of low molecular weight (benzodiazepines) are able to cross the BBB through ___, and others cross via _______.
foreign substances; 98%; diffusion; transport proteins
_______ (atenolol and penicillin) and drugs that are not bound to transport proteins (_____) are not able to cross the BBB, which makes it difficult for these drugs to reach the brain.
Water-soluble drugs; free drugs
During ____, drugs can cross the placenta much as they do across other membranes, and this affects both the fetus and the mother.
pregnancy
Drugs taken during the first trimester can lead to _______, ______, or other subtler defects.
During the third trimester, drugs may alter ________.
The ________ should be considered before any drugs are given during pregnancy.
spontaneous abortion, teratogenesis
fetal growth and development
risk-benefit ratio