A drug has been prescribed to decrease the effects of an endogenous chemical. The nurse would place this drug in which category?
1. An agonist
2. A partial agonist
3. An antagonist
4. An agonist-antagonist
3
Rationale 1: An agonist drug produces the same type of response as the endogenous substance.
Rationale 2: A partial agonist produces a weaker, or less efficacious, response than an agonist.
Rationale 3: An antagonist occupies receptor sites, preventing them from being activated by the medication. This prevents the endogenous chemical from acting.
Rationale 4: An agonist-antagonist produces a weaker, or less efficacious, response than an agonist.
Global Rationale: An antagonist occupies receptor sites, preventing them from being activated by the medication. This prevents the endogenous chemical from acting. An agonist drug produces the same type of response as the endogenous substance. A partial agonist produces a weaker, or less efficacious, response than an agonist. An agonist-antagonist produces a weaker, or less efficacious, response than an agonist.
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