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601501
Drug Administration
Descrição
Second year University Drugs and Disease Mapa Mental sobre Drug Administration, criado por lhay94 em 04-03-2014.
Sem etiquetas
drugs and disease
drugs and disease
second year university
Mapa Mental por
lhay94
, atualizado more than 1 year ago
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Criado por
lhay94
mais de 10 anos atrás
135
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0
Resumo de Recurso
Drug Administration
Oral
Advantages
easy and convenient
no skilled personal required
prep need not be sterile
immune system can cope
stomach
pH = acidic
Acid drugs
mainly non-ionised
readily absorbed
Basic drugs
mainly ionised
poorly absorbed
Neutral drugs
readily absorbed
Duodenum
pH = alkaline
basic drugs => mainly non ionised, readily absorbed
Acidic drugs => mainly ionised, absorption restricted
Disadvantages
effects are slow
absorption maybe incomplete
some drugs to big to be absorbed
some drugs destroyed by gut or liver
INHALATION
Large surface area of alveoli in lungs
good pulmonary blood supply
can have local effect on lung
systemic effects e.g. general anaesthetic
INJECTION
by-pass difficulties of absorption
drugs must be sterile => by passing immune system
exact dose is known
given by skilled staff
INTRAVENOUS
Advantages
rapid effect
lage volumes can be used
Irritant solutions can be used
Disadvantages
rapid delivery to heart, CNS => side effects
cannot recall drug
INTRAMUSCULAR & SUB-CUTANEOUS
Advantages
controlled onset with drug vehicle
aqueous - rapid effect
oily -slow effect
Disadvantages
Damage at injection site
Limited to small volumes
ROUTES determined by
drug chemical nature
how quickly an effect is required
how the effect needs to be maintained
patient condition/compliance
Convenience
many drugs bind to a plasma protein
bound fraction retained in plasma
unbound fraction diffuses into tissues (active)
DISTRIBUTION
out of plasma into tissues
move easily into interstitial fluid around tissues, interact with target
Distribution AWAY from target site => terminate effect
BLOOD-BRAIN/BLOOD-PLACENTA BARRIER
Capillaries in CNS = no pores
only lipophilic drugs can cross capillary membrane
placenta good barrier
only lipophilic drugs cross to foetus
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