Polyethylene glycols (PEGs) are frequently employed as vehicles in oral and parenteral dosage forms. PEGs have low toxicity, are miscible with aqueous fluids in all proportions, and dissolve many poorly aqueous soluble compounds. Compounds with poor aqueous solubility and resulting poor bioavailability and considerable individual variability in the absorption were shown to provide exceptionally high bioavailability and reduced inter-subject variability in plasma concentrations when dosed as solutions or suspensions in PEGs.

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