Ampoule

The Ampoule is an obtainable item in Silent Hill, Silent Hill 2, Silent Hill 3, Silent Hill 4: The Room, and Silent Hill: Origins. The ampoule is a rare and powerful healing item in the games they appear in. It will completely heal the playable protagonist, with the exception of Silent Hill 4: The Room. In Silent Hill 3, the ampoule also restores Heather Mason's stamina.

In Silent Hill: Homecoming, the ampoule is replaced by the serum. It is a powerful healing item that completely restores Alex Shepherd's health and also increases his maximum health.

Etymology
The word "ampoule" refers to a small sealed glass vial, the neck of which must be broken to transfer the liquid medicine inside to an unsealed vial (or, now more rarely, to a hypodermic needle). In Silent Hill, ampoules come with a hypodermic needle with which to administer the solution. The solution in the series is not directly identified, but its effects include limited tissue regeneration, increased clotting, energy increasing effects, and powerful pain-killers.