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Lecture 7

PSYB65H3 Lecture Notes - Lecture 7: Headache, Constipation, Methylphenidate


Department
Psychology
Course Code
PSYB65H3
Professor
Ted Petit
Lecture
7

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Lecture 7
Mechanisms of drug action, psychopharmacology of neural stimulants.
GENERAL INFO terms related to EVERY drug
HOW DRUGS ARE CLASSIFIED?
o PRESCRIPTION DRUG
You NEED a prescription
o OVER THE COUNTER DRUGS
You get it from a pharmacy but you DON’T NEED a prescription
o SOCIAL DRUGS
Nicotine, caffeine, alcohol
You can get them
You don’t have to go to a drug store
o Drugs which are not produced for their psychoactive effect
You cant just go to ANYONE and buy them
Marijuana, LSD
Then there are drugs that are produced and you can buy them
Airplane glue
TOLERANCE
o The concept that f a drug is taken repeatedly, most drugs show a decreasing
behavioral effect
o The more you take it, the less effect it has.
o The more you stimulate/ alter a system, the post synaptic side of the system will
compensate by reducing either the number or sensitivity of the receptors until it
reaches a level of equilibrium
o If you use something that slows a system down like depressants, the system will
compensate by increasing the sensitivity.
WITHDRAWAL
o If you have been taking the drug for A LONG PERIOD OF TIME and stop taking it
You have a craving for the drug
o The behavioural effect:
Opposite of the behavioural effect when the person is on the drug
It’s going to understimulate the postsynaptic cell from being happy to sad
Its not going to back to base line but beneath the baseline and then finally go
back to baseline.
For depressants: the activity increases from sad to happy
It’s going to go up above the baseline and then come back down to baseline.
o Generally not life threatening.
o Sometimes can be life threatening for alcoholics never take them off it
directly substitute valium gradually lower it
ADDICTION
o Person enjoys and becomes dependent upon the drug
o The more rapid the effect of the drug, the more addicting it is general rule
o In mild forms it is not addictive its slow and goes through the system slowly;
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