Final answer:
Naloxone (Narcan) is the correct answer as it is a pure opioid antagonist used to reverse opioid overdose, including respiratory depression.
Step-by-step explanation:
The drug that should be given to a patient who has received too much opioid agonist is a) Naloxone. This drug is a pure opioid antagonist and can rapidly reverse opioid overdose effects, including respiratory depression. Naloxone does not produce analgesia or euphoria in individuals who are not opioid-dependent, but it can precipitate withdrawal symptoms in those who are. It is used to counteract life-threatening depression of the central nervous system and respiratory system, making it critical in treating narcotic overdoses. It is commonly known by the brand name Narcan and is administered via a parenteral route due to its short duration of action.