Poly(ethylene glycol) is widely used in pharmaceuticals as a solvent, binder, and lubricant in tablet formulations. It helps in enhancing the solubility and bioavailability of poorly soluble drugs. In the medical field, it is utilized as a base for ointments, creams, and suppositories due to its water-soluble and non-irritating properties. It also serves as a crucial component in laxatives, helping to relieve constipation by drawing water into the intestines.

In biotechnology, it is employed in protein crystallization and as a precipitant in nucleic acid purification. It plays a significant role in cell fusion techniques, facilitating the creation of hybridomas for monoclonal antibody production. Additionally, it is used in the modification of therapeutic proteins to prolong their circulation time in the body.

In industrial applications, it acts as a dispersant, thickener, and stabilizer in various products, including paints, coatings, and adhesives. It is also used in the production of polyurethane foams and as a plasticizer in synthetic rubbers and plastics. In personal care products, it functions as a moisturizer and emulsifier in lotions, shampoos, and cosmetics.

Its versatility extends to research, where it is used in aqueous two-phase systems for the separation and purification of biomolecules. Overall, its adaptability and compatibility with numerous substances make it a valuable compound across diverse fields.