Poly(ethylene glycol) is widely used in pharmaceuticals as a solvent, binder, and lubricant in tablet formulations. It helps improve the solubility and bioavailability of drugs, making it essential in drug delivery systems. In the medical field, it is a key component in ointments, creams, and suppositories due to its moisturizing and stabilizing properties. It is also utilized in bioconjugation to modify proteins and peptides, enhancing their stability and reducing immunogenicity.

In industrial applications, it serves as a plasticizer in the production of polymers, improving flexibility and durability. It is also employed in the manufacturing of adhesives, coatings, and inks, where it acts as a thickening agent and stabilizer. Additionally, it is used in personal care products like shampoos, lotions, and cosmetics for its emulsifying and moisturizing effects.

In biotechnology, poly(ethylene glycol) is crucial for cell fusion techniques, such as creating hybridomas for monoclonal antibody production. It is also used in cryopreservation to protect cells and tissues during freezing. Furthermore, it plays a role in nanotechnology as a surface modifier for nanoparticles, enhancing their biocompatibility and stability.