Aims: The purpose of this study was to determine the content of the secondary metabolite compound in the flower extract of Rhinachantus nasutus (L.) Kurz (RnK); The potential of the extract as a radical scavenger of 2,2-diphenyl-1-picrylhydrazyl (DPPH); and its potential as an anti-inflammatory by inhibiting protein denaturation with bovine serum albumin (BSA). Results: Phytochemical screening results on the ethanolic extract of R. nasutus flowers revealed the presence of steroid glycosides, alkaloids, flavonoids, phenolics, and tannins. The extract has a strong ability to scavenge DPPH radicals with an IC50 value of 77.07 ± 0.05 mg/L. Besides that, the ethanol extract has very strong anti-inflammatory activity, with an IC50 value of 13.88 ± 0.2 mg/L. Conclusion: According to these findings, the ethanolic extract of R. nasutus flower can be used as an alternative anti-inflammatory drug.