Citrus aurantium are used as a source of synephrine, a stimulant similar to ephedrine, which also interacts with various medication. According to OPs article, g

Citrus aurantium are used as a source of synephrine, a stimulant similar to ephedrine, which also interacts with various medication. According to OPs article, grapefruit works in a different way. This article also mentions grapefruit: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5655712/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5655712/