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superagonist

n. An agonist capable of producing a maximal response greater than the endogenous agonist for the target receptor, and thus having an efficacy of more than 100%.

Wikipedia
Superagonist

In the field of pharmacology, a superagonist is a type of agonist that is capable of producing a maximal response greater than the endogenous agonist for the target receptor, and thus has an efficacy of more than 100%. For example, goserelin is a superagonist of the gonadotropin-releasing hormone receptor.