CYP2C19 variation and citalopram response.

Journal Article (Clinical Trial;Journal Article)

OBJECTIVE: Variations in cytochrome P450 (CYP) genes have been shown to be associated with both accelerated and delayed pharmacokinetic clearance of many psychotropic medications. Citalopram is metabolized by three CYP enzymes. CYP2C19 and CYP3A4 play a primary role in citalopram metabolism, whereas CYP2D6 plays a secondary role. METHODS: The Sequenced Treatment Alternatives to Relieve Depression sample was used to examine the relationship between variations in the CYP2C19 and CYP2D6 genes and remission of depressive symptoms and tolerance to treatment with citalopram. The primary analyses were of the White non-Hispanic patients adherent to the study protocol (n= 1074). RESULTS: Generally, patients who had CYP2C19 genotypes associated with decreased metabolism were less likely to tolerate citalopram than those with increased metabolism, although this difference was not statistically significant (P = 0.06). However, patients with the inactive 2C19*2 allele had significantly lower odds of tolerance (P = 0.02). Patients with the poor metabolism CYP2C19 genotype-based category who were classified as citalopram tolerant were more likely to experience remission (P = 0.03). No relationship between CYP2D6 genotype-based categories and either remission or tolerance was identified, although exploratory analyses identified a potential interaction between CYP2C19 and CYP2D6 effects. CONCLUSION: Despite several limitations including the lack of serum drug levels, this study showed that variations in CYP2C19 were associated with tolerance and remission in a large sample of White non-Hispanic patients treated with citalopram.

Full Text

Duke Authors

Cited Authors

  • Mrazek, DA; Biernacka, JM; O'Kane, DJ; Black, JL; Cunningham, JM; Drews, MS; Snyder, KA; Stevens, SR; Rush, AJ; Weinshilboum, RM

Published Date

  • January 2011

Published In

Volume / Issue

  • 21 / 1

Start / End Page

  • 1 - 9

PubMed ID

  • 21192344

Pubmed Central ID

  • PMC3090085

Electronic International Standard Serial Number (EISSN)

  • 1744-6880

Digital Object Identifier (DOI)

  • 10.1097/fpc.0b013e328340bc5a

Language

  • eng

Conference Location

  • United States