Some of the major classes of neuroactive drugs that modify consciousness include: 
- cannabinoids 
- stimulants
- hallucinogenics 

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Drug Effects 

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

A condition in which, with repeated exposure to a drug, an individual becomes less responsive to a constant dose. 
 
- Metabolic tolerance 
- Functional tolerance 
- Behavioral Tolerance
- Cross-tolerance 
- Withdrawal symptoms
- Sensitization 


Drug tolerance

The amount of drug that reaches the brain and the speed with which is starts acting are determined in part by the drug's route of administration. 
- bioavailable
- biotransformation
- pharmacokinetics
- blood brain barrier

Drugs are administered and eliminated in many different ways

May result from single-agent drugs but are more likely to occur when multiple agents that have side effects/risk are administered together 

Drug-Induced Neurologic Conditions 


Some major categories of psychoactive drugs impact and affect behavior: 
- antipsychotics relieve schizophrenia
- antidepressants reduce chronic mood problems
- anxiolytics combat anxiety
- opiates relieve pain

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