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Lecture 7

PSYB65- Lecture 7.docx

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Department
Psychology
Course
PSYB65H3
Professor
Ted Petit
Semester
Fall

Description
PSYB65 Lecture 7Drugs are classified differently prescription drugs are those that you have to have a prescription from your doctor to get over the counter drugs are the ones that are available from a pharmacy without a prescription social drugs are that you do not have to get from a pharmacy such as alcohol nicotine and caffeine the last group of drugs are not produced commercially or if they are produced commercially it is not for their psychoactive effect such as marijuana cocaine LSD Tolerance with most drugs as you take them repeatedly you get a decreasing or reduced behavioural effect the more you take a drug the brain compensates by somehow changing either the sensitivity or the number of receptors that are effected when a stimulant such as amphetamine or cocaine are taken and there is an overstimulation of the presynaptic neuron the brain responds by reducing the sensitivity or the number of receptors there is no drug that can stop neuroplasticity to overcome tolerance in a depressant slows down activity in the presynaptic neuron it activates more receptors in the postsynaptic neuron bringing the activity back to a normal levelWithdrawal when a patient who has already built up tolerance stops taking the drug patients behaviouralphysiological output changes now at normal levels activation there are not enough receptors to continue at normal activation becomes under activated causing depressive symptoms if one was taking stimulants when someone is coming off of depressants and going through withdrawal the presynaptic neuron goes back up to normal levels of activation all of the remaining extra receptors will be hyper activated causing overstimulation if you take someone off of a depressant
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