Abstract: A thermally reversible water in oil in water (W/O/W) emulsion including a thermally reversible viscosifying polymer in the continuous aqueous phase of the emulsion. The thermally reversible viscosifying polymer of the W/O/W emulsion includes a block copolymer having at least a first polyoxyalkylene block having a hydrophobic region and a hydrophilic region effective to form micelles in solution in response to a change in temperature, and at least a second block comprising a poly(vinylcarboxylic acid).

Abstract: A thermally reversible water in oil in water (W/O/W) emulsion including a thermally reversible viscosifying polymer in the continuous aqueous phase of the emulsion. The thermally reversible viscosifying polymer of the W/O/W emulsion includes a block copolymer having at least a first polyoxyalkylene block having a hydrophobic region and a hydrophilic region effective to form micelles in solution in response to a change in temperature, and at least a second block comprising a poly(vinylcarboxylic acid).

Abstract: A pharmaceutic composition includes a pharmaceutically acceptable carrier, comprising a reverse thermally viscosifying polymer. The polymer includes a linear block copolymer, wherein at least one block comprises a poloxamer; and at least one block comprises a biocompatible polymer or oligomer, in an aqueous medium. The composition also includes an active agent which imparts a pharmaceutic or cosmetic effect. The composition viscosities in response to an environmental stimulus. The composition is suitable for administration of the pharmaceutical agent across dermal, otic, rectal, vaginal, ophthalmic, esophageal and nasal mucosal membranes.