Pills are drugs in capsules. They are generally powders or particles that irritate the esophagus and gastric mucosa, or drugs that taste bad, are easy to volatilize, are easy to be decomposed by saliva in the mouth, and are easy to inhale into the trachea.
In addition, some drugs need to be dissolved and absorbed in the intestine, and the capsule protects the drugs from gastric acid. In medicine, it refers to the sacs made of special film-forming materials. The contents (such as powder, liquid, various drugs, etc.) are loaded into them according to the dose for easy swallowing.