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Ultrasonic speeds and density data of 4-aminobutyric acid in 0.05 M, 0.10 M, and 0.15 M aqueous metformin hydrochloride (MFHCl) solutions are measured at 308.15 K, 313.15 K, and 318.15 K. The isentropic compressibility (k S ), the change in isentropic compressibility ( k S ), the relative change in isentropic compressibility ( k S /k 0 S ), the apparent molal compressibility (k φ ), the limiting apparent molal compressibility (k 0 φ ), the transfer limiting apparent molal compressibility ( k 0 φ ), the hydration number (n H ), and the pair and triplet interaction parameters (k AH , k AHH ) are estimated. The above parameters are used to interpret the solute-solute and solute-solvent interactions of 4-aminobutyric acid in aqueous MFHCl solutions.

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