From SNPedia
rs1954787, located in an intron of the HTR2A gene, was found to be associated with a somewhat increased rate of successful response to treatment of depression with the drug citalopram. [PMID 17671280]
From the abstract of this article:
"The effect size of (this) GRIK4 marker alone was modest, but homozygote carriers of the treatment-response-associated marker alleles of both the GRIK4 and HTR2A (see rs7997012) genes were 23% less likely to experience nonresponse to (citalopram) treatment relative to participants who did not carry any of these marker alleles."
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