Introduction to Nursing Pharmacology Flashcards
A tablet or capsule taken by mouth goes through three phases—_____________________________________________ —as drug actions occur
pharmaceutic, pharmacokinetic, and pharmacodynamic
In the ________________________, the drug becomes a solution so that it can cross the biologic membrane.
pharmaceutic phase
there is no pharmaceutic phase when the drug is administered parenterally by
subcutaneous (subQ), intramuscular (IM), or intravenous (IV) routes
four processes of pharmacokinetic phase
absorption, distribution, metabolism (or biotransformation), and excretion (or elimination)
In the pharmacodynamic phase, a _______________________________ results
biologic or physiologic response
Approximately ______________ of drugs are taken by mouth
80%
The first phase of drug action
Pharmaceutic Phase
Pharmaceutic Phase is also called
dissolution
a process where a drug in solid form must disintegrate into small particles to dissolve into a liquid.
dissolution
are fillers and inert substances that are used in drug preparation to allow the drug to take on particular size and shape and to enhance drug dissolution.
Excipients
is the breakdown of a tablet into smaller particles
Disintegration
The two pharmaceutic phases are:
disintegration and dissolution
is the time it takes the drug to disintegrate and dissolve
to become available for the body to absorb it
Rate limiting
what capsules/tablets should not be crushed?
Enteric-coated tablets or capsules and sustained-release (beaded) capsules
factors that affect rate limiting
- Gastric Acidity
- Age - very young and elderly
- Enteric-coated tablets
- Food
is the process of drug movement to active drug action
Pharmacokinetic
is the movement of drug particles from the GI tract to
body fluids by passive absorption, active absorption, or pinocytosis
Absorption
factors that affect absorption
- Surface area of the small intestine
- Protein-based drugs
occurs mostly by diffusion
Passive absorption
- requires a carrier, such as an enzyme or protein, to
move the drug against a concentration gradient. - Energy is required for active absorption.
Active absorption
a process by which cells carry drug across membrane by
engulfi ng the drug particles
Pinocytosis
The three major processes for drug absorption through the gastrointestinal membrane are:
passive absorption, active absorption, and pinocytosis
Drugs that are _________________________ are absorbed faster than ________________________
lipid soluble and nonionized; water-soluble and ionized drugs
what factors affect drug absorption in the pharmacokinetic phase?
Blood flow, pain, stress, hunger, fasting, food and pH
medication routes that absorb drugs from fastest to slowest
Intramuscular (Deltoid) > Intramuscular (Gluteal) > Subcutaneous
The process in which the drug passes to the liver first.
First Pass Effect
_______________________ are given orally while
_______________________ are not given orally because they have extensive first-pass effect.
Warfarin and Morphine Sulfate; Lidocaine and some Nitroglycerins
is a subcategory of absorption
Bioavailability
It is the percentage of the administered drug dose that reaches the systemic circulation
Bioavailability
The percentage of bioavailability for the oral route is always ___________________-
less than 100%
The percentage of bioavailability for the IV route it is
100%
Factors that alter bioavailability include:
(1) the drug form (e.g., tablet, capsule, sustained-release, liquid, transdermal patch, rectal suppository, inhalation)
(2) route of administration (e.g., oral, rectal, topical, parenteral)
(3) GI mucosa and motility
(4) food and other drugs
(5) changes in liver metabolism caused by liver dysfunction or inadequate hepatic blood flow
is the process by which the drug becomes available to body
fluids and body tissues
Distribution
factors that affect Distribution
- blood flow
- affinity to the tissue
- protein-binding effect
- drug dose and its concentration
Drugs that are greater than 89% bound to protein are known as
highly protein-bound drugs
drugs that are 61% to 89% bound to protein are
moderately highly protein-bound drugs
drugs that are 30% to 60% bound to protein are
moderately protein-bound
drugs that are less than 30% bound to protein are
low protein-bound drugs
Highly protein-bound drugs
89% and above