Tablets: Obtained by compressing a powder. The air present between the particles is withdrawn, resulting in a solid product. The digestion of the drug begins already in the stomach. The sublingual versions are designed to dissolve with saliva, so that the active ingredients are absorbed by the oral mucosa, passing directly into the bloodstream, accelerating its effect.
Sugar coated tablets: These are tablets covered in sugar or some polymer derived from cellulose. This kind of coating serves to protect the active substance from air, light and moisture, as well as slow down the digestion of the drug.
In some situations, coating is necessary for the release to occur only in the gut.
Capsules: Contains the drug wrapped in a coating of gelatin (similar to the jelly which is bought in the supermarket for domestic consumption), which may or may not receive colouring. This gelatin serves to preserve the medicine from air, moisture and light, the capsules are digested in the stomach.