In situations like this, the right medication that should be administered is Naloxone. This medication is used majorly to treat emergency cases of an opioid overdose. The patient in this question is showing symptoms associated with opioid overdose, though this can't be found in the question. Naloxone is used to treat patients when they are showing symptoms such as unusual difficulty waking up, pinpoint pupils, breathing problems.
Although the question fails to show whether the symptoms are coming due to opioid overdose, Naloxone can still be administered to the patient. In the question, the patient is finding it difficult to arouse, meaning he's finding it difficult to wake from sleep. Also, the patient has pinpoint pupils.
The question also shows that the patient is having a low heart rate, respiratory rate. If Naloxone is administered, it will improve the condition of the patient. The medication should be administered very quickly to prevent the brain from damage.