A 21-year-old woman is brought into the emergency department by her college room

A 21-year-old woman is brought into the emergency department by her college roommate. The patient has been unconscious for at least 30 minutes. The patient’s roommate is unaware of any health condition but states that the patient has attended several college parties over the last weeks, and though she is uncertain of this fact, she believes her roommate “has been doing drugs.” On examination, the patient is somewhat pale. Her mucous membranes are dry. Her temperature is 98 °F, heart rate is 80 beats per minute (bpm), respiratory rate is 8 breaths per minute, and blood pressure is 90/60 mm Hg. The skin has no lesions suggestive of intravenous injections. Her heart and lung examinations are unremarkable. The abdominal examination reveals hypoactive bowel sounds, and the abdomen is nontender. The patient barely opens her eyes upon painful stimulus. There is no evident focal deficit. Pupils are miotic and sluggish. There is a normal gag reflex. Routine laboratory tests are normal. The pregnancy test is negative. A urine drug screen is positive for opiates.
What is the most likely diagnosis?
What is the next step in therapy?
References/Sources must be 2 scholarly peer-reviewed NURSING journals NO OLDER THAN 5 YEARS OLD.