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Meaning of Drugs. A drug is, in the broadest of terms, a chemical substance that has known biological effects on humans or other animals. Foods are generally excluded from this definition, in spite of their physiological effects on animal species.

Meaning of Drugs. In pharmacology, a drug is "a chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well-being." Pharmaceutical drugs may be used for a limited duration, or on a regular basis for chronic disorders.

Psychoactive drugs are chemical substances that affect the function of the nervous system, altering perception, mood or consciousness. Alcohol, nicotine, and caffeine are the most widely consumed psychoactive drugs worldwide.

Recreational drugs are drugs that are not used for medicinal purposes, but are instead used for pleasure. Common recreational drugs include alcohol, nicotine and caffeine, as well as other substances such as opiates and amphetamines. Meaning of Drugs.