terms Flashcards
halflife
the time required for the amount of drug in the body to decrease by 50%
steady state
the amount excreted = the amount absorbed with each dose
therapeutic index
ratio between toxic or lethal dose to the therapeutic dose
therapeutic range
level of drug in blood needed for therapeutic effect
peak levels for IV, IM and PO
15-30 mins after an IV
30-60 minutes after an IM
60 mins after PO
trough level
lowest amount of drug in the blood that is effective. drawn right before the next dose
toxicity
above the highest amount of drug that is over the peak level
duration
the length of time the drug is at the therapeutic level in the blood
loading dose
achieve a higher drug level faster
additive
1+1=2
synergistic
1+1=3
the combination of two drugs produce an effect greater than the sum of two
antagonistic
1+1=0
the combined effect is less than the effect produced by the active drug alone
potency
the amount of drug that is needed to produce a given effect
efficacy
the maximum effect that a drug can have
prototype
the first drug that is developed in a particular drug class