it depends on the co-solvents which you want to use. there is a way for predicting the effect of a solvent on the solubility enhancement and it is to compare the Hildebrand solubility parameters of the solute and the solvent. the more similarity in the value of this parameter results in more solubility increasing. for more detail you can see these two articles: J. Phys. Chem. C, 112, 3519–3524; Koleske, J. V. (1995). Paint and coating testing manual : fourteenth edition of the Gardner-Sward handbook, Chapter 35, ASTM, Philadelphia, PA.
Also, you can test the mixture of the solvents which is more effective than any solvent lonely.
Respected S. Soltanpour, Thanks a lot for the valuable information and good articles.
According to my experience, it is best to calculate the solubility parameter of the solute, then do solubility tests, with a solvent or solvent mixture with the same parameter
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