Adrenaline

Adrenaline is a passive item added in The Binding of Isaac: Afterbirth †.

Effects

 * Gives Isaac a flat damage up based on how many empty Heart containers he has.
 * The damage up given is 0.2 for each empty Red Heart container Isaac has.
 * Damage ups are only applied for every fully empty heart container.
 * The damage up given is ((2 * MissingHearts) ^ 1.6) * 0.1, where MissingHearts is the total half red hearts of health missing.

Trivia

 * Before v1.06.0190, Adrenaline was named Adderline.
 * Despite having its name changed, Adrenaline's item sprite is named collectibles_493_adderline in the game files.
 * Adrenaline is a hormone produced by the body in situations of high stress that increases blood circulation, breathing, and other things in preparation for the natural flight or fight reflex.
 * Adrenaline causes characters to have an animation that makes them look like they are breathing rapidly. The more health they're missing, the more exaggerated the animation is.