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Illegal drugs

Illegal drugs are those that are not prescribed by a doctor or bought at a drugstore. They are sometimes also called "street drugs."

Some examples of illegal drugs include heroin (an opioid); cocaine (a stimulant); LSD, mescaline, PCP, methamphetamine, and psilocybin (hallucinogens); and gamma-hydroxybutyrate (GHB).

The effects of illegal drugs can be unpredictable because:

  • Most drugs are very addictive.
  • People respond differently to the same drugs.
  • The strength or potency of the drug may be uncertain.
  • They may contain unknown or unexpected substances. There is no quality control for street drugs like that required for prescription drugs.
  • They may interact with other drugs or alcohol in unpredictable ways.
  • Even though they look like prescription drugs, they may contain dangerous chemicals.

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