In The Rock (1996), Nicolas Cage used an injection to stop himself from being infected by the deadly virus. Is that a real drug in real life or just some fictional creation? How does it stop virus infection in the movie?
There is no 'deadly virus' in The Rock. The weapon that is stolen by Frank Hummel's team is VX, a so-called nerve agent, a chemical that (amongst other things) interferes with your muscles and causes you to asphyxiate through a lack of ability to breathe.
The antidote that they use in the movie is Atropine which is a real chemical used to counteract the effects of nerve agents such as VX.
The effects of VX are not entirely realistically shown in the movie, but the agent itself and the antidote Atropine are real-life and not a fictional creation.