①It can mask the bad smell of drugs and reduce the irritant of drugs;
②Compared with the tablets and pills, it need not add adhesive; It can disperse fast, absorb well and use high bioavailability in gastrointestinal fluid;
③It improves the stability of the drug, which protects the drug from moisture and being exposed in the air;
④It can make up for the deficiency of other dosage forms; If oily or liquid medicine is difficult to be made into pills, tablets can be made into capsules; If the dosage is small, difficult to dissolve in water, the gastrointestinal tract is not easy to absorb the drug, can make it dissolve in the appropriate oil, then make the capsule to absorb;
⑤It can be made into slow and controlled release preparation; The drug can be made into granules and then coated with the polymeric material with different release rates, which can be made of several kinds of capsules, such as slow release and intestinal dissolution.
⑥Hard capsule has all kinds of color, printable, easy to identify.