Types of Suppository bases

• Suppository bases are vehicles that carry the active ingredients in suppositories.
• They are classified into two main categories: lipophilic (fat-soluble) and hydrophilic (water-soluble).
• The choice of base depends on factors such as drug solubility, stability, and release characteristics.

1. Lipophilic Bases

1. Cocoa Butter (Theobroma Oil)

   • A natural fat from cocoa beans, widely used in suppositories.
   • Melts at 34-36°C, just below body temperature, releasing the drug upon insertion.
   • Primarily used for rectal suppositories, but also suitable for vaginal use.

2. Hydrogenated Vegetable Oils

   • Examples: palm kernel oil, cottonseed oil.
   • Similar melting points to cocoa butter but may offer better stability and drug compatibility.

3. Fatty Acid Esters

   • Examples: glyceryl monostearate, glyceryl monopalmitate.
   • Synthetic bases with varying melting points, chosen for specific drug release profiles.

2. Hydrophilic Bases

1. Glycerinated Gelatin

   • A mixture of gelatin and glycerin (1:2 ratio).
   • Absorbs water, swells, and releases the drug.
   • Suitable for vaginal and urethral suppositories.

2. Polyethylene Glycols (PEGs)

   • Water-soluble polymers available in various molecular weights.
   • Dissolve or erode in body fluids, releasing the drug.
   • Used for flexible control of melting point and drug release.

3. Poloxamers

   • Nonionic surfactants with thermoreversible gelation (gel at body temperature).
   • High water content, ideal for vaginal or rectal use.

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