Coating Materials

• 
• Film Coating Materials: Include polymers like HPMC, plasticizers, and colorants.
• Enteric Coating Materials: Contain cellulose acetate phthalate or methacrylic acid polymers for delayed release.
•  It contains pigments and opacifiers to improve tablet appearance and protect light-sensitive drugs.

1. Film-Forming Polymers

   • Cellulose derivatives: Hydroxypropyl methylcellulose (HPMC), ethylcellulose, cellulose acetate.
   • Methacrylic polymers: Eudragit series.
   • Enteric polymers: Cellulose acetate phthalate (CAP), polyvinyl acetate phthalate (PVAP), HPMCP.

2. Plasticizers

   • Enhance film flexibility, reduce brittleness.
   • Examples: Glycerin, propylene glycol, triethyl citrate.

3. Colorants & Opacifiers

   • Provide aesthetic appearance, identification, or protect from light.
   • Examples: Titanium dioxide (opacifier), iron oxides (pigments).

4. Solvents

   • Organic solvents: Acetone, ethanol, isopropanol (less preferred due to toxicity, flammability, environmental concerns).
   • Aqueous systems: Water-based dispersions or solutions.

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