Many people also use prescribed and controlled depressants such as opioids, as well as opiates and benzodiazepines. However, heavy use of some drugs is socially stigmatized. In popular practice, recreational drug use generally is a tolerated social behaviour, rather than perceived as the medical condition of self-medication. Generally, recreational drugs are divided into three categories: depressants (drugs that induce a feeling of relaxation and calmness), stimulants (drugs that induce a sense of energy and alertness), and hallucinogens (drugs that induce perceptual distortions such as hallucination). When a psychoactive drug enters the user's body, it induces an intoxicating effect. Recreational drug use is the use of one or more psychoactive drugs to induce an altered state of consciousness either for pleasure or for some other casual purpose or pastime.