“Quercetin, hypericin, and kaempferol exhibited a remarkable inhibition of P-gp–mediated efflux of ritonavir by increasing its cellular uptake in these models.”
“There was a significant decrease in the Apical to Basal/Basal to Apical (AP-BL/BL-AP) transport ratio of ritonavir in presence of hypericin, kaempferol , and quercetin.”