Principle of clinical necessity. Drugs applied for archival filing and purchasing should be clinical (omitted) essential drugs. Provincial drug procurement (omitted) varieties can meet the clinical needs, in principle, it is not allowed to record procurement.
The principle of "whoever files, who purchases". Medical and health institutions are the main buyers of drugs for the record. Varieties that have been approved for filing are only available for purchase and use by medical and health institutions that apply for filing.