Drugs known to cause addiction include illegal drugs as well as prescription or over-the-counter drugs.
* Stimulants:
o Amphetamine and Methamphetamine;
o Caffeine;
o Cocaine;
o Nicotine.
* Sedatives and Hypnotics:
o Alcohol;
o Barbiturates;
o Benzodiazepines, particularly alprazolam, clonazepam, temazepam, and nimetazepam;
o Methaqualone and the related quinazolinone sedative-hypnotics;
o GHB and analogues (specifically GBL).
* Opiate and Opioid analgesics;
o Morphine and Codeine, the two naturally-occurring opiate analgesics;
o Semi-synthetic opiates, such as Heroin (Diacetylmorphine), Oxycodone, and Hydromorphone;
o Fully synthetic opiods, such as Fentanyl and its analogs, Meperidine/Pethidine, and Methadone;
* Anabolic steroids.
Addictive drugs also includes a large number of substrates that are currently considered to have no medical value and are not available over the counter or by prescription.