Any recreational drug commonly associated with nightclubs and raves or the clubgoing culture in general.

A medicinal drug which is effective in the treatment of some disease(s), but which is not manufactured or marketed because the demand is insufficient to cover the costs of supply.

The illegal drug trade.

A person who encourages people to take up illegal drugs, and then supplies that need for a price

(pharmacology) A licensed medicine that is regulated by legislation to require a prescription before it can be obtained.

(slang) The drug Viagra. / (slang) The drug ecstasy.

A person with a chemical or psychological dependency on a drug, especially one which is illegal or improperly procured.

Dominated or plagued by illicit drugs.

plural of drug addict

(US, informal) A pharmaceutical product that generates more than a billion dollars of revenue for its owner each year.