A neurolytic enzyme was an enzyme present in Vulcans. High levels of neurolytic enzymes were a symptom of Pa'nar Syndrome. In 2152, Doctor Phlox informed T'Pol that her neurolytic enzymes were up from the month previous, indicating that the treatments she had been undergoing up until that point were no longer effective. (ENT: "Stigma") In 2154, Phlox tested her enzymes twice within the span of one week and detected no change, indicating she had been cured of the syndrome. (ENT: "Daedalus")