Brief Description of Various Tablets

Uncoated Tablets

Uncoated tablets include single-layer tablets resulting from a single comparison of particles and multilayer tablets consisting of concentric or parallel layers obtained by successive comparison of particles of different composition.

Coated Tablets

Coated tablets are covered with one or more layers of mixtures various substances such as natural or synthetic resins, gums, gelatin, inactive and insoluble ifilers, sugars, plasticizers, polyols, waxes, coloring matters, flavoring substances. The substances used as coatings are usually applied as a solution or suspension in conditions in which evaporation of vehicles occurs. When the coating is veiy thin polymeric, the tablets are then known as film coated tablets.

Effervescent Tablets

Effervescent tablets are uncoated tablets generally containing acid substances and carbonates on hydrogen carbonates which reacts rapidly in the presence of water to release of C . They are intended to dissolve or to disperse in water before administration.

Soluble Tablet

Soluble tablets are uncoated or film coated tablets. They are intended to be dissolved in water before administration. The solution produced may be slightly opalescent due to added substances used in the manufacture of the tablets.

Dispersed Tablet

These tablets are uncoated or film coated tablets intended to be dispersed in water before administration giving a homogeneous dispersion.

Gastro resistant Tablet

These are modified release tablets that are intended to resist the gastric fluid and to release their active ingredients in the intestinal fluid. They are prepared by converting tablets with a gastro-resistant coating or from granule or particles already covered with a gastro-resistant coating.

Modified Release Tablet

These are coated or uncoated tablets containing special procedures which separately or together are designed to modify the rate or the place at which the active ingredient are released.