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Experimental solubilities of chlordiazepoxide, diazepam, and lorazepam in polyethylene glycol 200 (PEG 200) + water mixtures at 303.2 K were reported. The solubility of each drug increased exponentially with the addition of PEG 200 and reached the maximum value in neat PEG 200. The Jouyban-Acree model was used to mathematically describe the experimental data, and the solubilities were predicted using a previously trained version of the Jouyban-Acree model for PEG + water mixtures and the solubility data in monosolvents. The overall mean relative deviations of the models were 3.7 % and 18.3 %, respectively, for the fitted model and the trained version.