Pharmacologic Principles Flashcards
Topical route
skin, eyes, ears, nose, lungs, rectum, vagina
how fast do topical powders/solutions work?
immediately
do ointments/gels/creams have a local or systemic effect?
local, but some can be systemic (nitro)
Transdermal patches deliver a…
constant amount of medication
how fast is absorption from inhaled meds?
fairly rapid
what are suppositories?
a med put into the rectum or vagina
where is the enteral route absorbed
mucosa of the stomach, small, or large intestine
enteral is any form of medication the enters through…
the mouth
immediate release pills release…
all active ingredients quickly
extended release pills…
release slowly
syrups
contain active ingredients and large amounts of sugars
suspension/emulsion
powder mixed with liquid activates the medicine when shaken
elixir
sweetened alcohol and water
lozenges
never chewed or swallowed, placed in mouth & dissolves over time
Sublingual
placed under the tongue
parenteral
the fastest, any route other than GI tract (most common is IV)
first-pass effect
breakdown of potency of a medication in liver, reduces bioavailability of drug to <100%
parenteral bypasses the…
first-pass effect on liver
topical also bypasses…
the first-pass effect
what factors affect absorption?
- ability for drug to dissolve/solubility
- blood flow to administration site
- body surface area
During biotransformation (metabolism), the drug is altered to a…
less active form
half-life
- time required for 50% of a drug to be removed from the body
- after 5 half-lives, most drugs are considered eliminated
steady state
amount of drug eliminated is equal to the amount of drug absorbed
(rate in = rate out)
onset
how quickly a medication will work