A drug that is used primarily to relieve pain
are of three basic types: (1) Simple, nonnarcotic analgesics
that relieve pain by suppressing the local production of prostaglandins
and related substances; examples are acetaminophen
and the large group of nonsteroidal anti-inflammatory drugs
known as aspirin substitutes
(Motrin, Advil, Naprosyn, etc.). (2) Narcotic analgesics
or opioids ("like opium"
derivatives) that relieve pain by surpressing its perception in the brian
; examples are morphine
(natural derivatives of opium), and meperidine or pentazocine (synthetic drug products
). (3) Local anesthetics that prevent or relieve pain by rendering sensory nerve endings insensitive
to painful stimulation; an example is the urinary tract analgesic phenazzopyridine (Pyridium).
--From The Essential Guide to Prescription Drugs