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Pharmaceutical coating polymers are essential functional excipients engineered to form a thin, cohesive film over the surface of oral solid dosage forms to achieve specific physical, chemical, and therapeutic objectives. These high-molecular-weight compounds, which include cellulose derivatives, vinyl polymers, and acrylic resins, are strategically selected based on their solubility profiles to facilitate either immediate release (IR) for moisture protection and taste masking or modified release (MR) for site-specific delivery and sustained elution. By modulating the physicochemical characteristics of the coating interface, these polymers serve as critical barriers that safeguard the active pharmaceutical ingredient (API) from environmental degradation—such as light, oxidation, and humidity—while ensuring precise control over drug dissolution kinetics within the gastrointestinal tract. In modern pharmaceutical manufacturing, these polymers are applied through advanced aqueous or organic solvent-based processes to tablets, capsules, and multiparticulates, significantly enhancing patient compliance, product stability, and the overall clinical efficacy of the therapeutic regimen.
