Hi @gongliangz. I see that currently OMOP tables contain 9770 valid concepts from Multum and 8726 concept relationships ‘Maps to’. Unfortunately, I don’t know if there are any plans to update Multum in the future and continue to map it to RxNorm. This topic also discussed in 2017-2018 (Multum Drug Vocabulary, NHANES Multum Lexicon)
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