NDC：national drug code 国家药品代码
查询结果如下：
No matching records found. Use your browser's Back button to go back and enter a new search criteria.

Number of digits required depends upon the NDC configuration selected by the firm.

Be sure you have entered FOUR or FIVE digits into the labeler code field.
Be sure you have entered THREE or FOUR digits into the product code field.

Use leading zero's if necessary.

要知道，目前，FDA的NDC数据库只收载有处方药和胰岛素制剂：

What products are included in the NDC Directory?

The current edition of the NDC Directory is limited to prescription drugs and insulin products that have been manufactured, prepared, propagated, compounded, or processed by registered establishments for commercial distribution. The products have been listed in accordance with the Drug Listing Act and regulatory provisions concerning the submission of drug product information to FDA.

Why are some drug products not in the NDC Directory?

There are a number of reasons why a drug product may not appear in the NDC Directory, such as:

· the product may not be a prescription drug or an insulin product
· the firm has notified the FDA that the product is no longer being marketed;
· the firm has not complied fully with its listing obligations and therefore its product is not included until complete information is provided.
，这些我也看到了。