Final answer:
Codeine, hydrocodone, Percocet, and oxycodone are examples of opioid analgesics, which are drugs used to relieve pain by binding to opioid receptors in the brain and blocking pain signals.
Step-by-step explanation:
Codeine (Tylenol 3), hydrocodone (Vicodin, Norco), Percocet, and oxycodone are examples of opioid analgesics. Opioid analgesics are a class of drugs that are used to relieve pain. They work by binding to opioid receptors in the brain and blocking pain signals.