Highlights for the Final Flashcards
What sort of drug will more readily cross plasma membranes?
small, non-ionized, lipid soluble drugs
therapeutic index (TI) is
a ratio of the dose of a drug that produces toxicity relative to the dose of the same drug that produces a clinically desired response. Looked at as an equation, this would be T.I. = LD50 / EC50…thus a measure of the drug’s safety. A large value indicates that there is a wide margin between an effective dose and a toxic dose.
Which drug class has a high potential for abuse?
Class II
Stage 2 HTN
160-179/100-109
Stage 3 HTN
>180/110
What catalyzes angiotensinogen to angiotensin I
renin, a proteolytic enzyme formed in the granules of juxtaglomerular cells
Angiotensin I goes to Angiotensin II by being cleaved by
ACE (angiotensin converting enzyme) which is found mostly in the lungs but also the kidneys and brain and elsewhere
most potent vasoconstrictor produced by the body
angiotensin II
how do thiazide diuretics work
increase sodium and water excretion into urine by inhibiting sodium and chloride reabsorption in the cortical thick ascending limb and early distal tubule
side effect on minerals when taking thiazide diuretics
can cause calcium and uric acid to be reabsorbed by proximal tubule in increased amounts…so serum levels of calcium and uric acid rise
Primary thiazide diuretic
hydrochlorthiazide (HCTZ)/hydrodiuril
what supplement is generally recommended when taking hydrochlorthiazide/hydrodiuril
potassium
patients with a sulfa allergy should not take these drugs because they contain a sulfonamide moiety
hydrochlorthiazide (HCTZ)/hydrodiuril and furosemide/lasix
main loop diuretic
furosemide/lasix
what do loop diuretics do
inhibit chloride reabsorption in the ascending loop of Henle by blocking the Na+/K+/Cl- co-transporter system
***Rank diuretics from strongest to weakest
***loop > thiazide > potassium sparing?
loop diuretics can increase the loss of
sodium, potassium, calcium, and magnesium
bioavailability is
fraction of administered drug that reaches systemic circulation in an unchanged form…(if 100 mg of a drug is taken orally and 70 mg of the drug is absorbed unchanged, then the bioavailability of that drug is 70%)
half life is
the amount of time required for the plasma concentration of a drug to decrease by 50% after discontinuation of a drug
the EC50 or effective concentration 50 is
the concentration or dosage of an agent which induces a specified clinical effect in 50% of the subjects to which the drug has been administered.
LD50 or lethal dose 50 is
the concentration or dosage of an agent or drug which causes death in 50% of the subjects to which that agent or drug has been administered.
efficacy refers to
the degree to which a drug is able to induce maximal therapeutic effects. Efficacy is a term often used to compare drugs of different classes.
drug class with no approved medical use
Class I
drug class with moderate potential for abuse
Class III