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Thermo-acoustic study of binary and ternary mixtures has interesting results. In this communication we have reported interaction between niacin with alcohol-water and also in ethylene glycol medium. The densities and speed of sound for liquid solutions containing vitamin B3 (niacin) at discrete (0.03, 0.05, 0.07 and 0.09 mol·kg−1) concentrations in aqueous methanol and with ethylene glycol solvent at different temperatures have been measured by the help of multi-frequency ultrasonic interferometer. From volumetric experimental data "Wada's Constant (W), Rao's Constant (R), Vander Waal's constant (b), intermolecular free length (Lf), acoustic impedance (Z), apparent molar volume (Vɸ)" are calculated. The "apparent molar isentropic compression (Kɸ,s), hydration number (nH)" are calculated using experimental acoustic data. The inter and intra molecular interactions of niacin in liquid medium are reported in this communication. The solute-solvent interactions in the said binary and ternary mixtures are also discussed. [ABSTRACT FROM AUTHOR]