Pharmacology Flashcards
what do competitive inhibitors change
potency of a drug. they increase Km
what do non competitive inhibitors change
they change the efficacy of a drug. they decrease Vmax
pharmacokinetics
what the body does to the drug
pharmacodynamics
what the drug does to the body
half life equation
.7 x Vd / CL
loading dose calculation
CP Vd/ F where F is bioavailability and Cp is the target plasma concentration you want
Maintenance dose calculation
Cp CL x t / F where t is the dosage interval (time between doses)
3 drugs that are zero order
PEA- this is round like a O
phenytoin, ethanol, aspirin (at very high concentrations)
drugs that are weak acids
phenobarbital, methotrexate, aspirin- give basic things like bicarbonate to trap it for an overdose.
drugs that are weak bases
amphetamines- give NH4Cl (ammonium chloride) to trap it
Therapeutic Index (TI)
TD50/ED50
sympathetic G protein classes
qiss
parasympathetic (M) G protein class
qiq
dopamine G protein class
si
histamine G protein class
qs
Vasopressin G protein class
qs
which ones use Gq
HAVe 1 M&M
which ones use Gi
M2a2D2- 2 MAD
bethanechol
direct M agonist
used for post operative ileus, and urinary retention. resistant to ache
carbachol
direct M agonist
used for glaucoma, pupillary constriction and relief of intra ocular pressure
pilocarpine
direct M agonist. potent stimulator of sweat, tears and saliva. can be used in both open and closed angle glaucoma.
methacholine
direct M agonist. this is used as a diagnostic test for asthma.
neostigmine
anticholinesterase. used for an ileus, urinary retention, MG, and reversal of NM blokade. no CNS penetration
pyridistigmine
anti cholinesterase. longer acting for MG. does not penetrate the CNS.