Equi Block is the number one equine topical pain reliever sold worldwide. The reason for this is simple, effectiveness and results! Racehorse Strength Equi-Block blocks more pain, decreases more inflammation, works faster, lasts longer (most horses receive up to 24 hours of pain relief), requires less product and less applications to achieve desired results! Racehorse Strength Equi Block will not scurf or blister and will absolutely not test positive.