dixon Flashcards
What is designed to provide continuous controlled releases of medication through a semi permeable membrane over a given period of time
transdermal patches
Most common problem with patches
local irriation, erythema, and edema
under the tongue?
sublingual
projestins implanted under skin to release a drug over a prolonged duration? Ex birth control
implants
the study of how a drug enters the body
pharmokinetics
the process by which drug molecules are transferred from the site of administration to the circulating blood
absorption
oral absoprtion requires
disruption, disintegration, dispersion, dissoloution
initial disruption of a tablet coating or capsule shell is neccassary
disruption
tablet or capsule contents must break apart
disintegration
drug particles must be spread throughout the stomach or intestine
dispersion
drugs must be dissolved in GI fluids
dissouloution
the ___ ____ is form that exerts the effect
free drug
All drugs in 2 forms in blood
bound to plasma proteins and as free drug
is the amount of time that passes for the concentration of a drug to fall to 1/2 its blood level at anytime
half life t1/2)
short action and quickily removed
short half life
long acting and slowly removed
long half life
for drugs to penetrate the CNS they must pass across _______
blood brain barrier
passage across ______ involves simple diffusion in accordance to lipid solubility
placenta
the bodys way of changing a drug so that it can be more easily excreted by the kidnys, most common site is the liver
metabolism (biotransformation)
3 different mechanisms of metabolism
- active to inactive
- inactive to active
- active to active
an inactive compound may be formed from an active parent
most common
active to inactive
inactive parent drug may be transformed into an active compound (termed prodrug)
inactive to active
active parent drug may be converted to a second active compound which is than converted to inactive compound
active to actove
