Substance Abuse & Addiction

Substance Addiction Treatment

This section of the site has extensive information about different types of drugs:  Effects, signs of abuse, health risks, withdrawal symptoms, detox and treatment.

Most psychoactive drugs fall into the categories of stimulants, depressants, opiates and hallucinogens. All these types of drugs are addictive, induce dependence and have different effects on the human brain and body.


Stimulants act on the central nervous system and are associated with feelings of extreme well-being, increased mental and motor activity. Examples include cocainecrack cocaineamphetamines (speed) and ecstasy (which is also a hallucinogen).


Depressants are chemicals that slow down the central nervous system and suppress brain activity causing relief from anxiety. The most common depressants are alcohol and cannabis. Others include barbiturates and benzodiazepines (e.g. valiumxanaxtemazepam).

Opiates & Opioids

Opiate and opioid drugs provide pain relief, euphoria, sedation and in increasing doses induce a coma. Examples include heroin, morphine, opium, methadone, dipipanone and pethidine. Click to read about heroin and opiate detox at Castle Craig.


Hallucinogens cause changes in a person’s perception of reality. These include cannabis, LSD, ecstasy and psilocybin (magic mushrooms).