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biological

Judged: two independent readers; copy check clear.

opioid agonist

opioid agonist An opioid agonist is a substance that activates opioid receptors.

An opioid agonist is a substance that activates opioid receptors. In this packet, it refers to an agent that acts on mu and kappa opioid receptors in the colon and may help reduce visceral pain and spasms.