and what they do.

The Kinds:

Depressant: substances which slow down the normal function of the central nervous system. These drugs include barbiturates, benzodiazepines, morphine, heroin, and alcohol. (http://www.drugfree.org/drug-guide/depressants)

Hallucinogen: substances that cause you to her, taste, smell, see, feeling things that do not exist. These drugs include mushrooms, marijuana, and acid.

Stimulant: elevate mood, increase feelings of well-being, and increase energy and alertness. These drugs include cocaine, methamphetamine, amphetamines, methylphenidate, nicotine, and MDMA. (http://teens.drugabuse.gov/drug-facts/stimulants)

The Effects:

Psychological and Physiological

Depressants: psychological: slowed pulse and breathing, slurred speech, drowsiness, lowered blood pressure, poor concentration, fatigue and confusion, impaired coordination, memory and judgment. physiological: addiction, impaired sexual function, chronic sleep problems, respiratory depression and respiratory arrest, and death.

Hallucinogens: psychological: people see images, hear sounds, and feel sensations that seem real but are not. physiological: blood pressure, pulse rate, respiration drop, nausea, vomiting, blurred vision, flicking up and down of the eyes, drooling, loss of balance, and dizziness. (http://www.drugabuse.gov/publications/drugfacts/hallucinogens-lsd-peyote-psilocybin-pcp)

Stimulants: psychological: feelings of tremendous joy, increased wakefulness, and decreased appetite. People who abuse them can become more talkative, energetic, or anxious and irritable. psychological: paranoia, aggressiveness, extreme anorexia, thinking problems, visual and auditory hallucinations, delusions, and severe dental problems.