Principles of Pharm Flashcards
Any chemical that effects living process
drug
study of drugs and their interactions with living systems
pharmacology
study of drugs in humans
clinical pharmacology
use of drugs to diagnose, prevent, or treat disease or prevent pregnancy or simply the medical use of drugs
pharmocotherapeutics
Properties of Ideal Drug
Effectiveness
Safety
Selectivity
drug that can actually treat what needs to be treated
effective drug
drug that cannot produce harmful effects - all drugs can produce harmful effects but with proper dosing and selection can reduce harm
safe drug
drug that only elicits the response for which it is given
selective drug
Other drug characteristics
reversible action predictability ease of administration low cost chemical stability - moisture can decrease effectiveness "keeping medicine in bathroom"
Objective that provides maximum benefit with minimal harm.
Therapeutic objective
4 phases of pharmacokinetics
absorption
distribution
metabolism
excretion
Types of passage ways of drugs across membranes
channels and pores
transport systems - (P-glycoprotein transporter)
direct penetration of the cell membrane
only small ions such as K and Na can go through
channels and pores
type of transport system that is selective, may require energy, moves drug out of cells. ex: liver, kidney, placenta, intestines, brain.
p- glycoprotein
movement of drug from its site of administration to bloodstream
absorption
Positives of IV route
rapid precise large volume if needed emergencies if unable to take PO
Negatives of IV route
irreversible once administered infection can cause fluid overload embolism special training to place iv line
IM/SQ route adv/dis
advantages: quick (30mins)
disadvantages: painful, few administration sites, bleeding risk, less convenient for oral
med will dissolve in intestines; “plastic covering over tablet
enteric coated
filled with “beads”
sustained release
what exits the blood when there is kidney damage
albumin
what binds 99% of the time with albumin rather than receptor sites (drug won’t work as well if binded to albumin); only 1% actually goes to tissues
warfarin
which drug binds to 10% of albumin, leaving 90% absorbed in tissues
gentamicin
what can limit distribution of medicines due to having no capillaries
abscesses and tumors