Years ago I was in my doctor's office when a guy in the back flipped out and started screaming about needing a renew on his prescription.
Went on for a few minutes, then two security guards for the building came trotting through the waiting room and into the back.
Things quieted down pretty quickly. He and the guards must have left through a back door because they never came back through the lobby that I saw.
When I finally got in to see my doctor I made a comment about this visit being more exciting than normal. He chuckled, rolled his eyes, and didn't say anything.
I figure it's a pretty good chance the guy was looking to get a refill on valium or some narcotic. I doubt he would have been that worked up over Alegra.