Trisodium phosphate dodecahydrate serves as a corrosion inhibitor for iron in 0.1 M NaClO4 solutions, effective under both aerated and deaerated conditions. Additionally, it acts as an excipient in pharmaceutical formulations, functioning primarily as a pH regulator and buffer. These excipients, also known as pharmaceutical auxiliaries, are substances utilized in the pharmaceutical manufacturing process besides the active pharmaceutical ingredients. They are crucial for enhancing the stability, solubility, and processability of pharmaceutical products. Moreover, pharmaceutical excipients play a significant role in influencing the absorption, distribution, metabolism, and elimination (ADME) of co-administered drugs, thereby affecting their efficacy and safety [1] [2].