Flakka is made from the chemical alpha-PVP, a synthetic version of the stimulant cathinone. Flakka is in the same class of chemicals used to make bath salts.

GHB is a central nervous system depressant.

Heroin is an illegal substance that has been around for quite some time, but recent abuse of the opioid has skyrocketed in concert with prescription opioid abuse.

Kratom is a plant-based drug that produces stimulant effects. Kratom is illegal in certain states.

Methadone is a powerful opioid that is similar to morphine and has a sedative effect.

Methamphetamine and amphetamine belong to a group of drugs called sympathomimetic amines that are central nervous system stimulants.

Methaqualone is a sedative hypnotic. Street names for methaqualone include Quaaludes and Quades.

Nicotine/cotinine is a common drug that is not currently illegal, but not allowed in some workplaces.

Opiates refer to a class of drug that has been used for thousands of years for treatment of pain and remain the primary drugs used in pain management.