Final answer:
Methamphetamine, or meth, is a stimulant drug that belongs to a class of psychoactive substances which increase alertness and wakefulness. Examples of meth include crystal meth and speed. Classification and examples refer to organizing drugs based on their pharmacological effects and citing specific substances in those categories.
Step-by-step explanation:
Methamphetamine, commonly known as meth, is classified as a stimulant drug. Stimulants are substances that stimulate the brain, increasing alertness and wakefulness. Meth is included in this category because it enhances the activity of certain neurotransmitters in the brain, particularly dopamine, resulting in increased energy and focus. Common examples of stimulants include caffeine, nicotine, cocaine, and other amphetamines such as Adderall and meth. Specifically, meth can be found in forms like crystal meth and speed. The classification and examples of drugs refer to how substances are categorized based on their effects on the human body, and representative substances for each category.
When discussing classification and examples, this means identifying the group or category a drug fits into based on its pharmacological effect and then providing specific instances of drugs within that category. As for meth, one would not classify it as a hallucinogenic drug (like LSD and magic mushrooms), an opioid drug (like heroin and fentanyl), or an over-the-counter drug (like pain relievers and cold medicine).