Studies related to Schizophrenia and L-Tyrosine

L-tyrosine Pharmacotherapy Of Schizophrenia: Preliminary Data

Effect None
Values Mostly no effect, but worsening smooth-pursuit eye movement. Tables 1 and 2.
Trial Design Non-randomized controlled trial
Trial Length 2-4 Weeks
Number of Subjects 11
Sex Male
Notes for this study:
In this double-blind, placebo-controlled trial with unclear randomization, 11 male participants with schizophrenia took 10 g of tyrosine or placebo daily in addition to an anti-psychotic medication for 3 weeks before crossing over.

There wasn't a statistically significant difference between groups for brief psychiatric rating scale, or for positive symptoms. Negative symptoms also weren't significantly different, and neither was abnormal involuntary movement and physical symptoms on the Simpson-Angus Scale. Memory and performance on the Wisconsin Card Sorting Test weren't significantly different.

Smooth-pursuit eye movements were worsened, with more pronounced saccades in general.