Trial reportThe pharmacogenomics journal2026
The role of cytochrome P450 polymorphisms in the pharmacokinetics of oral esketamine.
Trial report in The pharmacogenomics journal, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
9 authors.
Funding
Abstract
Oral esketamine displays therapeutic potential for treatment-resistant depression. However, treatment is complicated by a low and variable bioavailability. Genetic polymorphisms in the cytochrome P450 (CYP) enzymes responsible for esketamine's metabolism may influence bioavailability. In a subsample of patients included in a placebo-controlled trial investigating repeated, low dose oral esketamine (N = 18), blood samples were collected four hours after dosing. CYP2B6 516 G > T, CYP3A4*22, and CYP3A5*3 genotyping was performed, and the plasma levels of esketamine and its metabolites were measured. CYP2B6 516 G > T carriers (Mdn = 5.1 µg/L) demonstrated higher esketamine plasma levels compared to non-carriers (Mdn = 2.1 µg/L) (U = 45.00, p = 0.032). No significant associations were observed for CYP3A4*22 carriership (n = 2) or CYP3A5*3 heterozygosity (n = 2), nor for esketamine's metabolites. In summary, CYP2B6 516 G > T is associated with higher esketamine plasma concentrations. Further research with more participants is warranted to draw conclusions about CYP3A4*22 and CYP3A5*3. Clinical trial registration: NTR6161 (Dutch Trial Register).
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