This invention describes compositions comprising at least 75 mg/mL of solubilized otherwise poorly soluble drug in an aqueous environment, wherein the composition further comprises a combination of 3 or more acids. Methods of providing analgesia, anti-pyretic effects or reducing pain in a subject presenting with a pain condition, and methods of reducing administration site irritation, inflammation or a combination thereof in a subject presenting with a pain condition, comprising the steps of administering such compositions and infusion pumps containing such compositions are also described.