designer drug; unregulated drug; legal high
Euphemistic term for substances sold as 'legal' alternatives to illegal drugs, often with similar effects but not yet controlled by law. Compare 脱法ドラッグ (dappō doraggu), which is a near-synonym.
See also: 脱法ドラッグ
It was sold as a legal drug, but later became regulated.
The use of designer drugs among young people has become a problem.