The Med Hypo was originally a usable item to replenish health during the early development of BioShock. Instead of filling the health bar like a First Aid Kit, the Med Hypo gives a boost of at least 30% health, but with an additional process of slowly filling the player's health bar for at least eight seconds. Despite being mentioned once in the Audio Diary, Big Night Out, it was replaced by the First Aid Kit in the final game.