L8 L9 Flashcards
(34 cards)
The most important route for execretion is
Kidney or Urine
Drugs are eliminated from the body either …… or……
Unchanged or Converted to metabolites
The time taken to reduce the
plasma drug concentration by half
Elimination Half Life
The amount of drug
cleared from the body per
unit of time
Drug clearance
Drugs must be What to be
eliminated from the body?
Polar
Other non important routes for clearance are?
Feces (Intestine or bile)
Lungs
Breast milk
sweat, saliva, tears, hair, and skin
What is excreted by lungs
Anesthetic gases
What stages affects the half life?
Metabolism and Excretion
What are the Clinical situations resulting in changes in drug half-life
diminished renal or hepatic blood flow
Liver faliure of metabolism
Kidney failure of excretion
The patient with issues in the half life duration require?
A decrease in dosage or less frequent dosing intervals
Whenever the drug inhibits metabolism or in hepatic insufficiency that will cause
cirrhosis
Decrease in excretion causes
Renal diseases
Which routes Absorption plays an important role in
oral, inhalation, and dermal exposures
The two absorption kinetic parameters of concern are:
1- The rate of absorption
2- The extent of absorption (or bioavailability)
The rate of absorption detects what
The onset (The start of the action of the drug)
How fast it absorbs
When a medicine is administered via non-intravenous it’s bioavailability generally decreases due to?
due to incomplete absorption and first-pass metabolism
or may vary from patient to patient
Bioavailability is one of the essential tools in which of the following
- pharmacodynamics
-pharmacokinetics
-Metabolism
pharmacokinetics
What should be considered when calculating dosages for non-intravenous routes of administration
Bioavailability
What might increase the volume of distribution
Renal or hepatic failure
Why renal failure causes an increase in Vd
due to fluid retention
Why hepatic failure causes an increase in Vd
due to altered body fluid and plasma protein binding
Vd is decreased when
There is dehydration
Usefulness of Vd is?
Calculation of the loading dose of a drug
Clearance is also refered to as
The rate of excretion