diff --git a/code/modules/reagents/chemistry/reagents/medicine.dm b/code/modules/reagents/chemistry/reagents/medicine.dm
index 538e3fd5b00..c520bf1286b 100644
--- a/code/modules/reagents/chemistry/reagents/medicine.dm
+++ b/code/modules/reagents/chemistry/reagents/medicine.dm
@@ -416,8 +416,7 @@
 	taste_description = "cleansing"
 
 /datum/reagent/medicine/potass_iodide/on_mob_life(mob/living/M)
-	if(prob(80))
-		M.radiation = max(0, M.radiation-10)
+	M.radiation = max(0, M.radiation - 25)
 	return ..()
 
 /datum/reagent/medicine/pen_acid