Allergiesatopic marchEvidence 2A

rs901865 · HRH1

Risk-Allele Phenotype

HRH1 rs901865 — associated with altered drug response related to desloratadine — sedation;Urticaria. This variant may influence medication efficacy or adverse reaction risk.

Reference-Allele Phenotype

Normal HRH1 function at this locus, with no elevated genetic risk contribution to desloratadine — sedation;Urticaria from this variant.

Evidence Level

2A — Moderate — meta-analysis See methodology for how we grade evidence.

Cross-References

dbSNP — rs901865
ClinVar — search rs901865
NCBI Gene — HRH1

Informational only

This page summarizes population-level evidence about a genetic variant. It is not a diagnosis. Your individual risk depends on your full genome, lifestyle, environment, and family history. Consult a healthcare provider for personalized medical advice.

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