Manufacturers prefer Pharmaceutical Capsule where the drug cannot be compressed into a solid tablet so they are simpler to swallow They are also helpful because the medicine must be combined with oil or another substance in order to be absorbed by the body. Capsules are classified as either hard or soft. Hard capsules are composed of a solid shell divided into two parts that match together and are then filled with the medication. On the other hand, in soft capsules, the substance is mixed with a solvent in the middle and the capsule layer melts in the stomach within minutes.