therap Flashcards
gaba effect on glutamate
glut is excitability, gaba inhibits glut
gaba a recep
ionotropic (no mediators therefore stim is instant rxn)
gaba b recept
metabotropic (req mediator therefore slower)
phenytoin moa and ae
ae: ihib the conc of serotonin
moa: It alters Na+, K+ and Ca2+ conductance and membrane potential
Thereby at therapeuticconc, it blocks Na+ channels and inhibit the generation of repetitive action potential
req high loading dose + non zero/linear kinetics
Carbamazepine moa use and ae
for focal (partial) and generalised tonic clonic seizures
can be used in combination with phenytoin
blocks Na+ channels inhibits high-freq repetitive firing of neurons
ae: potent microsomal enzyme inducer and it significantly interferes with clearance of ARVs
Spinabifida occur inapproximately 1% of the offspring of pregnant women treated with carbamazepine
can cause theSteven-Johnson syndrome
Valproic acid moa
It increases levels of GABA in the brain
mechanism of action inpatients with absence seizures remain unexplained
Ethosuximide use moa and ae
for less toxic drugs to treat absence seizures in children nb much lionger half life in infants and elderly because of red liver function
moa: It reduces theCa2+currents in the thalamic neurons
ae: Gastrointestinal side effects
Gabapentin use moa
analogue of GABA originally developed for spasticity - so acts on the enzyme not the recept
moa: It increases the conc. and the rate of synthesis of GABAin the brain
Phenobarbital use and moa
used to control most seizures
moa: It enhances the GABA receptors to prolong openings of Clchannels
summary of moa of antiseiz drugs will come out in exam
will literally come out
dopamine hypothesis
They block dopamine on D2 receptors in the mesolimbic system (hippocampus)of the brain
Sustained high-dopamine tone in the striatum has been proposed to contribute to hallucinations
dopaminergic tracts and functions
nigrostriatal - motor control and vol movt
mesolimbic - mood and behav
mesocortical - speech and thinking
tuberinfundibular - secr of prolaction
lithium pharm
competes with mg in enzymes
resp for recycling PIP2 which decrease conc of dopamine (inhib of IMPace enzyme)
moa of dopamine
manic state- dec level of dopamine (depletion of myo-inositol through inhib of IMPase)
depression state- inc level of serotonin in dorsal and lat hippo ( byinhib GSK-3)`
ae of lithium
inc blood ca2 and parathy H
thus inc risk of renal fx