PEGylated Drugs: Extending the Biological Half-Life
PEGylation is the chemical process of attaching Polyethylene Glycol (PEG) chains to a drug molecule. In 2026, this is a cornerstone technology for making "difficult" drugs last longer in the human body.
How PEGylation Works
Think of PEG as a "stealth shield." When attached to a protein or a nanoparticle:
Reduced Renal Clearance: The PEG chain increases the "hydrodynamic size" of the drug, making it too large to be filtered out quickly by the kidneys.
Immune Evasion: The "stealth effect" masks the drug from the body's immune system, preventing premature destruction by white blood cells.
Improved Solubility: It helps dissolve hydrophobic (water-fearing) drugs, allowing for easier injection.
Examples: Pegfilgrastim (to boost white blood cells) and Pegloticase (for severe gout) are widely used 2026 examples.