Block consisting of a large amount of hydrophobic polymer composed of poly (lactide-co-glycolide) copolymer or poly (lactide) polymer and a small amount of hydrophilic polyethylene glycol polymer B-block as A-block and having a total weight average molecular weight Soluble ABA-or BAB-triblock polymers, which exhibit reversible thermal gelation properties. Effective concentrations of triblock polymer and drug are uniformly included in the aqueous phase to form a drug delivery composition. The drug release rate can be controlled by varying the hydrophilic / hydrophobic component content, polymer concentration, molecular weight and dispersity of the triblock polymer. Since the triblock polymer is amphoteric, it is a composition as can be seen from the phase diagram showing the gelation behavior of the PLGA-PEG-PLGA triblock copolymer aqueous solution studied at different concentrations and temperatures. Thereby increasing the solubility and stability of the drug.
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