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oxycodone is an opioid analgesic. it produces its analgesic activity by binding with the mu-receptor present in the central nervous system. therefore, they mimic the effect of endogenous opioids.

Oxycodone acts directly on several tissues not related to its analgesic effect. These tissues include the respiratory center in the brain stem, the cough center in the medulla, muscles of the pupils, gastrointestinal tract, cardiovascular system, endocrine system, and immune system.