The solubilities of irbesartan (form A) in ethanol, acetone, chloroform, dioxane, and tetrahydrofuran between 278 K and 323 K are measured by a synthetic method. A laser technique is used to determine the disappearance of undissolved solute particles. Results are correlated by a semiempirical equation, the calculated results of which are proved to show fine representation of experimental data.