Here is the list of drugs that is being used for their mood altering properties. You can also read here the risk from taking these drugs. Not all users experience dependency, but there are real risks and, in a small number of cases, they can be fatal.

Depressants:

Barbiturates - used as sleeping pills, capsules or liquids; sometimes injected.

• Harmful Effects: calmness and anxiety, slowed heart rate and breathing, lethargy. Overdose can lead to coma, brain damage or even death. Risk of HIV and other; infections if injected with shared needles.
• Signs of Usage: drowsiness, lack of interest and slurred speech. User may appear disoriented.

Benzodiazepines - usually swallowed as tranquilizer pills or capsules such as diazepam, nitrazepam and temazepam.

• Harmful Effects - relaxation, reduced anxiety, slowed physical and mental functioning, depression. Blunted perception of pleasure and pain. Tolerance can lead to need for increased dosage.
• Signs of Usage - Drowsiness, poor concentration, increased aggression. Normal inhibition is reduced or disappears.

Solvent - inhaled as vapors from glues, lighter fuels and cleaning fluids.

• Harmful Effects- Euphoria, giddiness, confusion, loss of appetite. Outbreaks of bad temper. Overdose is easy and can lead to organ damage or death from asphyxiation or heart failure.
• Signs of Usage - Changed behavior and personality. Dilated or constricted pupils, bloodshot eyes, swelling around eyes, nasal discharge. Breath and clothes frequently smell or solvent fumes.

Stimulant:

Amphetamines - Swallowed as tablets (including "ecstasy); occasionally inhaled as powder or injected in solution.

• Harmful Effects - Quickened pulse, nervous exhaustion, insomnia, depression, dizziness, palpitations and paranoia. Risk of infection if injected with shared needles. Overdose may cause seizure or heart failure.
• Signs of Usage - Hyperactivity, dilated pupils, staring or prominent eyes, bad breath, mouth ulcers, flushed skin.

Cocaine - Inhaled or injected as cocaine hydrochloride powder; smoked as crack.

• Harmful Effects - enhanced self- confidence, racing pulse, loss of appetite, agitation, anxiety and depression. Dependence, damaged nasal passages, risk of infection if needles shared. Overdose may cause seizure or heart failure.
• Signs of Usage - Nasal discharge, weight loss, behavior or personality change.

Pain Reliever

Opiates - smoked, inhaled or injected as heroin; injected or swallowed as methadone, codeine or other narcotic drugs.

• Harmful Effects - lack of energy, unconsciousness, shallow breathing, loss of self-control. Diminished reaction to pain and anxiety; feelings of contentment. Dependence frequently develops. Risk of HIV and other infections if needles shared.
• Signs of Usage - constricted pupils, speech slow and slurred. Inhalation causes nasal rawness or redness, injection leaves needles marks.

Drugs That Can Change Perception

Cannabis - smoked or swallowed as dried leaf, resin or oil.

• Harmful Effects - feeling of euphoria, spinning sensation, mood swings, dry mouth, hunger, loss of coordination and sense of time, drowsiness. Panic, confusion and paranoia with large doses.
• Signs of Usage - mood swings, bloodshot eyes. Increased appetite.

LSD (lysergic acid diethylamide) - Swallowed in various forms.

• Harmful Effects -disturbed sensation, hallucination, paranoia, panic, depression, tolerance. Flashbacks and psychological problems from "bad trips" are possible.
• Signs of Usage - Unpredictable or violent behavior, dilated pupil.