The Grief Serum
The Grief Serum is the antidote that the Gladers give to someone who is stung by a Griever. It arrives in a syringe with their weekly supplies. After someone has taken the Grief Serum, they go through a process called the Changing. During the Changing, the patient goes through extreme pain, as well as regaining some of the memories of their past life. A person who is stung by a Griever and does not receive the Grief Serum dies.
It was mentioned in the Maze Runner Files that the Griever's sting gives the Gladers a mutated version of the Flare that can be cured with the serum. The serum has cured multiple major characters: Thomas, Gally, and Alby.
In the movie, the Grief Serum is in the form of a blue liquid, contained within a metal tube with an injector tip. It is only sent down with Teresa which is the first time that the Gladers have seen it. They're skeptical at first but decide to try and use it on Alby anyway. Contrary to their anxieties, it doesn't make Alby anty worse and it cures him.
