INFLUENCE OF SEROTONIN TRANSPORTER-LINKED POLYMORPHIC REGION (5-HTTLPR) VARAINTS ON CLINICAL OUTCOMES IN THAI PATIENTS WITH DEPRESSIVE DISORDER *Kamolwan Tantipiwattanaskul, Duangchit Panomvana, and Verayuth Praphanphoj The influence of the serotonin transporter polymorphisms on fluoxetine clinical outcomes was determined in 69 Thai patients with major depressive disorder. The results indicated that patients with l/l genotype had a significantly better response to fluoxetine treatment when compared with s allele carriers either evaluated based on the Thai HRS-D scores or psychiatrist efficacy evaluation (p = 0.001). At the same time, carriers with s allele had significantly higher rate of various side effects than the l/l genotype group (p = 0.002). These preliminary data might be used to reduce or prevent adverse effects and improve prescribing efficacy for depressive patients with different genotypes.  <br /> International Journal Of Pharmacy 2249-1848 209 2013-07-01 3 426-430 Copyright (c) Pharma Scholars. All rights reserved 2013