Head to the A-Wing exit. On y our way you will see a small fight between C-Note and Scofield. You'll pick up an empty box of PUGNAc. Your task is to get to the infirmary and check out Scofield's medical reports. Follow the doctors going into the cafeteria #1. Wait for the guard to move and jump over the fence. Watch out for another guard #2, sneak by him once he turns his back to you.
In the next room you will encounter a mechanic #1, sneak by him very slowly. Go up the ladder, use the pipe to cross to the other side and then jump over the fence #2.
Grab the ledge, approach the open window #1 and jump inside through it. Inside there are tons of guards and doctors #2.
Sneak up to the double door in front of you, where you will find a doctor #1. Pass by him very, very slowly or else he'll notice you. Climb up the shelves and open the vent. Once inside, move to the next room #2 while avoiding falling down [quick time event].
Approach the door and wait for the doctor and guard to move away. Get to the next room #1. Once Tancredi and Scofield leave the room, go inside and read Michael's medical report #2. Time to inform Mannix about the news.
Open the door and quickly move to the staircase. Below there's a camera and a walking doctor #1. Wait a moment and go to the bars. Once the guard enters the small room #2, sneak below the windows and exit outside.
Use the phone booth and call Mannix. C-Note will once again offer his help in the potential riots. In order to get his trust, you have to obtain a medicine call PUGNAc, which can be found in the loony bin. First of all, you'll need a picklock. Head to Abruzzi. In return for the tool, you'll have to get a knife from the kitchen. Once again jump over the fence and go into the cafeteria #1. Look out for the guard, walking from one window to another. Wait for a good moment and jump forward #2.
The door at the next room is locked, so use the pipe #1 to get into the kitchen. Inside there are just cooks #2.
Approach the first stand #1, from which you can easily get to the right side of the room. Your next target is the column - look out for the chef wandering nearby. The further path is just as easy, just move from one cover to another #2.
Eventually you will reach a table with the knife on top of it. Take it and head to Abruzzi. Follow the same path which you took on your way here, but this time go through the double door. The next corridor is completely empty #1. You will get the picklock, so now you can go get the medicine. The first chance to use your new tool will appear on the spot, you have to open the double door #2, no rush. For more info on opening locks, check out the Tips section.
Wait for the guard to leave the room. Hide behind the boxes #1 and move forward once the warehouseman turns around. Before you are two cameras. You can avoid the first one when it's turned right or run below and hit it to disable it for a bit. As for the second one, wait for it to turn towards the door #2.
In the warehouse you will come across one guard - go around the bags in the middle, next to the column, from the left #1. A bit further there are two more warehouse-keepers, ignore the first one and go left up the stairs. Once you approach the door, the second keeper will start to move in your direction. Quickly hide between the column and the bags #2.
The road to the facility is a rather simple one, with not many guards to avoid #1. After getting outside, approach the car and underneath [LMB] and afterwards go out on its other side. Use the covers and move forward #2.
Two more guards will decide to take a walk, which will ease your task #1. Jump behind some more boxes, while keeping an eye on the guard. Inside there's a ton #2 of guards, so you'll have to make things easier by activating the alarm.
Enter the ventilation shaft #1. Move forward from the next room, while trying to look out for the talking guards #2.
Eventually you will get to a valve #1 - turn it to activate the alarm and make everyone run from the building. Once the corridors become empty, run to the room with the medicine. The door is locked, so you have to pick the lock. This time you have to be fast about it, as a guard is approaching #2. Take the medicine and head to the exit. On your way there you'll get attacked by one of the patients, who will stab you with a syringe. You have to get to the door [quick time event].
Charles will save you. You will wake up in the middle of a riot in the A-Wing. Fight two enemies #1, #2 before the room gets filled with gas and everyone pass out.