Narcotics

Depressants

Stimulants

Hallucinogens

Cannibus

Possible Effects

euphoria, drowsiness, respiratory depression, constricted pupils, nausea

slurred speech, disorientation, drunken behavior without odor of alcohol

increased alertness, excitation, euphoria, increased pulse rate and blood pressure, insomnia, loss of appetite

analogues, illusions, & hallucinations, poor perception of time and distance

euphoria, relaxed inhibitions, increased appetite, disoriented behavior

Effects of Overdose

Slow & shallow breathing, clammy skin, convulsions, coma, possible death

shallow respiration, clammy skin, dilated pupils, weak and rapid pulse, coma, possible death

agitation, increase in body temperature, hallucinations, convulsions, possible death

Longer, more intense "trip" episodes, psychosis, possible death

fatigue, paranoia, possible psychosis

Withdrawal Syndrome

watery eyes, runny nose, yawning, loss of appetite, irritability, tremors, panic, cramps, nausea, chills and sweating

anxiety, insomnia, tremors, delirium, convulsions, possible death

apathy, long periods of sleep, irritability, depression, disorientation

withdrawal syndrome
not reported

insomnia, hyperactivity, decreased appetite occasionally reported

Risk of Physical Dependence

High

Moderate to High

Possible 

Unknown 

Unknown 

Risk of Psychological Dependence

High

Moderate to High

High

Unknown,
High for Phencyclidine and analogs (i.e. PCP)

Moderate