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The physical and psychological effects of psychoactive drugs depend on how they act on the central nervous system that, in turn, affects our thoughts, feelings and actions. Psychoactive substances include legal, illegal and prescription drugs. It is impossible to predict exactly how a drug will affect any one person. Effects usually relate to how much is used, how often it is used and what other drugs are used. The following factors also influence drug effects. The dosage level of a drug is a major factor influencing drug effect. Generally, the larger the dose or higher the purity, the greater the effect of the drug. Overdose occurs when the amount of the drug taken exceeds the body's capacity to effectively cope with the drug. Depending on the drug taken, the central nervous system is either over-stimulated or slowed down so much that life is threatened. |
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