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Objective To explore the effect of exogenous purine nucleotide on the augmented atabolism of neurocyte nucleotide induced by morphine. 嗎啡在鎮(zhèn)痛的同時(shí)引起葯物依賴癥狀，因此老年慢性疼痛患者不建議長(zhǎng)期使用此類葯物止疼。