Algesia And Analgesics

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Chapter: Essential pharmacology : Opioid Analgesics And Antagonists

Algesia (pain) is an ill-defined, unpleasant sensation, usually evoked by an external or internal noxious stimulus.


ALGESIA AND ANALGESICS

 

Algesia (pain) is an ill-defined, unpleasant sensation, usually evoked by an external or internal noxious stimulus.

 

Analgesic A drug that selectively relieves pain by acting in the CNS or on peripheral pain mechanisms, without significantly altering consciousness.

 

Pain is a warning signal, primarily protective in nature, but causes discomfort and suffering; may even be unbearable and incapacitating. It is the most important symptom that brings the patient to the physician. Excessive pain may produce other effects—sinking sensation, apprehension, sweating, nausea, palpitation, rise or fall in BP, tachypnoea. Analgesics relieve pain as a symptom, without affecting its cause. They are used when the noxious stimulus (evoking the pain) cannot be removed or as adjuvants to more etiological approach to pain. Analgesics are divided into two groups, viz.

 

Opioid/Narcotic/Morphine-like Analgesics.

 

Nonopioid/Nonnarcotic/Aspirin-like/Antipyretic Or Anti-Inflammatory Analgesics.

 

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