Pills Guide#

Pills are the consumables in The Binding of Isaac that test your memory the most: they differ only by color, yet their effects are reshuffled every run. Unlike cards, you cannot judge what a pill does from its appearance — you can only map colors to effects by testing. This page compiles the real effects of every pill in the current version (including the Repentance DLC), the Horse Pills enhanced variants, and the related synergy items, for quick reference while testing. Card and rune effects are constant across runs — see Cards and Runes Collection Guide.

Core Mechanic: Colors and Effects Are Randomized Every Run#

The pill system’s basic rules are completely different from cards; internalize these before testing:

“First use reveals” is the key to the whole system: the testing cost is paid only once, and after confirmation same-color pills become reliable consumables with known effects. The “negative reduction” can be verified directly with the Speed pills — Speed Up grants +0.15 movement speed while the corresponding Speed Down only takes 0.12, the latter being about 80% of the former. This reduction rule makes the expected loss from testing smaller than many people imagine.

Testing and Identification Strategy#

Since colors are reshuffled every run, you must rebuild the color-to-effect table each run. Here is the lowest-risk testing workflow:

Complete Pill Effects Table#

The effects below are confirmed data for the current version, grouped by use. The English names in the Pill column are the in-game originals.

Stat Up and Down Pills#

Health and Resource Pills#

Combat and Summoning Pills#

Exploration and Field Pills#

Status Change Pills#

Challenge-Exclusive Pills#

The following two pills only appear in Challenge #24:

Horse Pills: Enhanced Pill Variants#

Horse Pills are the oversized pill variant added in Repentance, bigger and more visually distinct. The rule is simple: same color and same effect as the normal pill, but fully enhanced in strength. Confirmed comparisons:

The enhancement amounts of the remaining Horse Pills follow in-game behavior; the direction is always enhancement, never nerf. Eat the bigger pill on sight — it will never hurt you.

Items That Synergize with Pills#

PHD is the qualitative-changer of the pill system: with negatives converted to positives, every pill becomes a pure-gain consumable, and a pill-focused playstyle is finally viable.

Common Misconceptions Cleared Up#

Strategy Summary#

• Testing discipline: the first few pills of every run are always eaten in a cleared safe room; confirm effects before deciding whether to keep, use, or swap the rest;
• Slot trade-offs: pills and cards share the pocket slot — think before picking up; an unidentified pill is not necessarily better than a known card in hand, but revealed good pills deserve priority;
• Stat pills have zero timing cost: Speed Up, Tears Up, Range Up and Luck Up carry no timing considerations once confirmed — just eat them;
• Time healing pills right: hold Full Health, Balls of Steel and Bad Trip (fallback triggers at low health) for low health or before a Boss fight;
• Use exploration pills unconditionally: I Can See Forever opens every Secret Room entrance on the floor — the best-value pill in the game; use it the moment you get it;
• Handling negatives: use Health Down as soon as possible while containers are plentiful; Luck-down pills can be kept to be neutralized by a later Luck Up.