“…It is used topically as a decongestant and given orally, as drops or spray for the nose, in many cases including, for example: allergies, colds, flu, sinusitis, and nasal tumors benign 2,3 . There are different analytical techniques for determination of PHE in bulk form and dosage forms including, ion pair chromatography 4 , electrochemical 5 , titrimetry 6 , capillary zone electrophoresis 7 , high-performance liquid chromatography [8][9] , fluorescence 10 , voltammetry 11 , and spectrophotometry [12][13][14] . Spectrophotometry is paired with Flow Injection Analysis (FIA) and utilized as detectors in FIA system to detect certain samples and elements 15 .…”