When Dr. Robby says "Yeah let's get addiction services on the case too" he is first shown going behind Langdon's back. A second later, he does the same movement but this time in front of him.
The college student that was unresponsive in the car was given Narcan-an opiate antagonist. After she became responsive and woke up again, she eventually admitted to taking Xanax-a Benzodiazepine. Narcan would not reverse Xanax overdose.
It was not a proper Xanax prescription and was presumed to be laced with fentanyl, hence the use of narcan.