Opioids are substances that act on opioid receptors to produce morphine-like effects. Medically they are primarily used for pain relief, including anesthesia.

Heroin, also known as diacetylmorphine and diamorphine among other names, is an opioid used as a recreational drug for its euphoric effects.

Cocaine is a powerfully addictive stimulant drug made from the leaves of the coca plant native to South America.

An anxiolytic is a medication or other intervention that reduces anxiety.

Research chemicals are chemical substances used by scientists for medical and scientific research purposes.

Stimulants is an overarching term that covers many drugs including those that increase activity of the central nervous system and the body, drugs that are pleasurable and invigorating, or drugs that have sympathomimetic effects.