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Opiates are very effective in means of suppressing pain and alleviating anxiety. Besides they produce a distinguished euphoric effect. That is why opiates are often used as recreational drugs. Psychological and physical dependence on opiates leading to addiction is a common outcome of regular use of opiates.

The term stimulants (or psychostimulants) refers to psychoactive compounds which temporarily activate neurological activity, increase mental alertness, awareness, wakefulness, locomotion and etc. In other words psychostimulants are drugs with energizing or/and mood-elevating effects.

Cannabis sativa (cannabis) is a wild hemp. Due to its psychoactive properties for a long time it was used both the treatment and still has been using to achieve a particular euphoric state characterized by general body relaxation and hallucinogenic effects.
Mephedrone is a synthetic psychostimulant from amphetamine class. Mepedrone was synthesised in 1929, but was out of practical use until 2003 when it was “rediscovered' by underground chemist and drug addict known by nickname “Kinetic”. And four years after the drug was available for sale on internet.
Multiple addiction is addiction on two, three and more psychoactive substances at a time. There can be various combinations of drugs from different classes. The most frequent drugs combinations are: heroin + cocaine; cocaine + alcohol; heroin+ MMDA (ecstasy); heroin + THC ( marijuana); alcohol+ amphetamines+ MMDA+ THC; benzodiazepines usually take part in every combination