Psychopharmacology is a branch of psychology that studies how drugs affect mood, sensation, thinking or behavior. These substances may be natural or artificial.
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These are chemical substances that alter perception, mood or consciousness. They include stimulants like caffeine and depressants like alcohol.
Pharmacokinetics: The study of what happens to a drug from when it enters until it leaves your body - absorption into bloodstream; distribution around body; metabolism into different substances; excretion out of body.
Pharmacodynamics: This is the study of how drugs affect our bodies. It looks at the biochemical and physiological effects of drugs and their mechanisms of action.